The pH of the solution when no base is added is 0.424.
An aqueous solution's acidity or basicity can be determined using the pH scale. The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.
The chemical formula of hypochlorous acid is HClO.
1 mole of HClO produces 1 mole of hydrogen ions and 1 mole of fluoride ions.
KOH (aq) + HClO (aq) → KClO (l) + H2O (l)
To calculate the pH of the solution when no base is added, we use the equation:
[tex]p_{H} = - log {H}^{+}[/tex]
We are given:
[tex]H^{+} = 0.376 M[/tex]
Putting values in the above equation, we get:
[tex]p_{H} = - log (0.376)[/tex]
[tex]p_{H}[/tex] = 0.424
Hence, the pH of the solution when no base is added is 0.424
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Based upon the ion charge of the following polyatomic ions, predict the formula for the following compounds.
sulfate = SO42
phosphate = PO43
hydroxide OH-
sodium hydroxide
O Na(OH)2
O Na(OH)3
O Na₂OH
O NaOH
Answer:
D.) NaOH
Explanation:
Sodium always forms the cation, Na⁺.
Hydroxide is always written as OH⁻.
The compound should have an overall charge of 0 (be neutral). As you can see, the charges perfectly balance out (+1 + (-1) = 0). Therefore, there only needs to be one atom of each ion. The ionic compound is thus NaOH.
In a calorimetry experiment 2.50 g of methane is burnt in excess oxygen. 30% of the
energy released during the combustion is absorbed by 500 g of water, the temperature of
which rises from 25°C to 68°C. The specific heat capacity of water is 4.184 J/g°C. What
is the total energy released per gram of methane burnt?
The total energy released per gram of methane in the experiment is 119941.33 J/g
How to determine the change in the temperature of waterInitial temperature of water (T₁) = 25 °CFinal temperature of water (T₂) = 68 °CChange in temperature (ΔT) = ?Change in temperature (ΔT) = T₂ – T₁
Change in temperature (ΔT) = 68 – 25
Change in temperature (ΔT) = 43 °C
How to determine the heat absorbed by the waterThe absorbed by the water can be obtained as illustrated below:
Mass of water (M) = s00 gChange in temperature (ΔT) = 43 °C Specific heat capacity of the water (C) = 4.184 J/gºC Heat (Q) =?Q = MCΔT
Q = 500 × 4.184 × 43
Q = 89956 J
How to determine the energy released by methane in the experimentHeat absorbed by water = 89956 JPercentage of heat absorbed by water = 30%Heat released by methane =?Heat absorbed by water = 30% of heat released by methane
89956 = 30% × heat released by methane
89956 = 0.3 × heat released by methane
Divide both sides by 0.3
Heat released by methane = 89956 / 0.3
Heat released by methane = 299853.33 J
How to determine the heat released per gram of methaneHeat released by methane (Q) = 299853.33 JMass of methane (m) = 2.5 gHeat per gram (ΔH) =?Q = m × ΔH
Divide both sides by m
ΔH = Q / m
ΔH = 299853.33 / 2.5
ΔH =119941.33 J/g
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Kendra knew from science class that water freezes at 0°C. She started to wonder
about the freezing points of other clear liquids. She decided to conduct an
experiment using vinegar, rubbing alcohol, and bleach. She pours 50 mL of each
liquid into three plastic containers that are all the same. She puts them in the freezer
at the same time and places the same brand thermometer in each liquid. Kendra
checks the temperatures every ten minutes and records her observations in her
journal.
Independent Variable:
Dependent Variable:
Three Control Variables:
YesYes , the water freezes at 0°C and every substance has it's own freezing points.
What is Freezing point ?The temperature at which a liquid solidify.The temperature at which the liquid and solid substance are in equilibrium at atmospheric pressure: melting point of water is 0°Celsius or 32°Farenhiet.
The freezing point of alcohol will be -114°C .
The freezing point of Bleach will be 19°F .
The Freezing point of vinegar will be 28°F .
The freezing point of rubbing alcohol will be- 100°C .
So,every substance has it's own freezing point.
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Which of the following ionic formulas is INCORRECT?
a) K₂O
b) Fe₂(SO4)_3
c) CUPO4
d) (NH4)_2S
e) CaBr₂
Answer:
c) CuPO₄
Explanation:
Copper commonly forms the cation Cu²⁺.
Phosphate is a polyatomic anion which can be represented by PO₄³⁻.
In order to have proper charge balance (an overall charge of 0), there must be three copper cations and two phosphate anions within the compound. As such, the correct ionic formula is Cu₃(PO₄)₂.
Determine the acid dissociation constant (Ka) for a 0.200 M solution of hydrogen sulfate ion with
the pH of 1.35 if the reaction for the dissociation of this acid is
HSO 4 →→ H+ + SO 4-²
(Hint: [H+] = 10-PH; Ka = [product]/[reactant])
The acid dissociation constant(Ka) is 0.0095
The reaction for this dissociation of acid is
HSO4 ⇄H+ + SO4 -2
The dissociation constant can be determined from the following expression
[tex]Ka= \frac{[H+] [SO4]-2}{[HSO4}[/tex]
[H+] = 10-PH
= 10-1.35
[H+] = 0.0447
[H+] = 0.0447 mol / L
From equation, [H+] = [SO4-2] = 0.0447 mol / L
[SO4-2] = 0.0447 mol / L
From the values of [H+], [SO4-2] and [HSO4] Ka can be calculated as follows,
Ka = 0.0447 * 0.0447 / 0.200
= 0.0019 / 0.200
= 0.0095
Hence the value of the acid dissociation constant (Ka) for the given reaction is 0.0095
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What are the component of black powder and why are they needed to cause an explosion
Hi There!
Black powder is an explosive powder consisting of saltpeter, sulfur, and charcoal, used chiefly in old guns fired for sport, in fireworks, and for spotting charges in practice bombs; black gunpowder.
In addition to being easily ignited by friction and impact, black powder is also extremely sensitive to flame and spark. It ignites violently when unconstrained and explodes when lit in even the slightest amount of confinement.
Thank you,
Eddie
Please help me with this reaction
The major product from the above organic reaction is I
In this reaction, methoxy ethane undergoes addition reaction with hydrogen bromide, Markownikoff's rule being involved in the reaction.
What are organic compounds?Organic compounds are the compounds which contains carbon and hydrogen.
Generally, organic compounds are characterized by the following:
All organic compounds contains carbon Organic compounds are also combustible in nature They are mostly covalent bonded molecules They are all soluble in non-polar solvents.They can be isolatedThey can also be prepared in the laboratoryBelow are some classes of organic compounds:
AlkanesAlkenesAlkynesAlkanolsAlkanoic acidAlkanalsEstersKetonesAminesSo therefore, the major product from the the above organic reaction is IV
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Question 6
How many mole of potassium hydroxide are in 27.5 mL of 0.250 M
potassium hydroxide solution?
Answer:
0.00688 moles
Explanation:
The molarity ratio looks like this:
Molarity = moles / volume (L)
After you convert mL to L, you can plug the values into the equation and simplify to find moles.
27.5 mL / 1,000 = 0.0275 L
Molarity = moles / volume <----- Molarity ratio
0.250 M = moles / 0.0275 L <----- Insert values
0.00688 = moles <----- Multiply both sides by 0.0275
How much heat is needed to melt 10.0 grams of ice at -10°C until it is water at 10°C?
Group of answer choices
A. +83.6 J
B. +3963 J
C. -3963 J
D. -83.6 J
Taking into account the definition of calorimetry, sensible heat and latent heat, the heat needed to melt 10.0 grams of ice at -10°C until it is water at 10°C is 3,969.5 J.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heatSensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
In this case, the amount of heat a body receives or transmits is determined by:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m. c is a specific heat substance.ΔT is the temperature variation.Latent heatLatent heat is defined as the energy required by a quantity of substance to change state.
When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.
In this case, the heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to
Q = m×L
where L is called the latent heat of the substance and depends on the type of phase change.
This caseFirst, you have to get the ice from -10°C to 0 °C, which is the melting point. Then you have to melt the ice into liquid water. Now, you have to get the water from 0°C to 10°C.
-10°C to 0 °CIn this case, you know:
c= specific heat capacity of ice= 2.108 [tex]\frac{J}{gK}[/tex]m= 10 gΔT= Tfinal - Tinitial= 0 °C - (-10 °C)= 10 °C= 10 K because being a temperature difference, the difference is the same in °C and K.Replacing in the definition of sensible heat:
Q1= 2.108 [tex]\frac{J}{gK}[/tex]× 10 g× 10 K
Solving:
Q1= 210.8 J
Heat needed to melt iceIn this case, you have to melt the ice into liquid water. Being the specific heat of melting of ice is 334 J/g, the heat needed to melt 10 grams of ice is calculated as:
Q2= 10 grams× 334 J/g
Solving:
Q2= 3,340 J
0°C to 10 °CIn this case, you know:
c= specific heat capacity of liquid water is 4.187 [tex]\frac{J}{gK}[/tex]m= 10 gΔT= Tfinal - Tinitial= 10 °C - 0 °C= 10 °C= 10 K because being a temperature difference, the difference is the same in °C and K.Replacing in the definition of sensible heat:
Q3= 4.187 [tex]\frac{J}{gK}[/tex]× 10 g× 10 K
Solving:
Q3= 418.7J
Total heat required
The total heat required is calculated as:
Total heat required= Q1 + Q2 + Q3
Total heat required= 210.8 J + 3,340 J + 418.7 J
Total heat required= 3,969.5 J
In summary, the heat needed to melt 10.0 grams of ice at -10°C until it is water at 10°C is 3,969.5 J.
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OMG PLEASE HELP!! THIS IS IMPORTANT!!
which statements describe the cell membrane? Check all that apply
A.) The cell membrane is very selective.
B.) The cell membrane lets anything enter the cell.
C.) The cell membrane lets anything leave the cell.
D.) The cell membrane is protective layer surrounding a cell.
E.) The cell membrane allows waste to leave the cell.
Answer:
The cell membrane is protective layer surrounding a cell.
Answer:
options D is correct
....hope it helps you
how do scientists believe that chloroplasts got into photosynthetic cells?
The development of chloroplast is thought to occur through endosymbiosis.
According to the endosymbiosis, some of the organelles found in modern eukaryotic cells, such as mitochondria and chloroplasts, were previously prokaryotic microorganisms. A non-photosynthetic creature acquired one photosynthetic cell, and the chloroplast was subsequently created.
An organelle known as a chloroplast is crucial to the process of photosynthesis in plants. It contains pigments like chlorophyll and other pigments that are in charge of capturing sunlight. Since each chloroplast has two membranes, other organelles such as mitochondria are referred to as double-membrane organelles. It is believed that cyanobacterial endosymbiosis played a role in the genesis of the chloroplast. Prokaryotic organisms like cyanobacteria have the capacity to prepare their food through the process of photosynthesis.
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Answer:what’s the answerr
Explanation:
↬ [tex]what \: is \: psi \:?[/tex]
[tex] \large \underline{ \boxed{ \tt \red{Pounds \: per \: square \: inch}}}[/tex]
[tex] \: \: \: [/tex]
( PSI ) is a measurement of pressure in the Imperial system of measurement.
PSI is commonly used to measure the pressure of gasses (pneumatic pressure) or liquids (hydraulic pressure). PSI is also used as a measure of tensile strength, defined as resistance to pulling forces, and elastic modulus strength, defined as resistance to deformation, which controls the stiffness of materials.[tex] \: \: \: [/tex]
hope helps ~
Question 6(Multiple Choice Worth 5 points)
(08.01 LC)
Which of the following is a property of water?
It can freeze very fast.
OIt has low heat capacity.
It exists in all three states on Earth.
It repels other water molecules.
The property of water is that It exists in all three states on Earth.
The major residences to be able to be mentioned in this text are its appeal to polar molecules, its high specific warmth, the excessive warmness of vaporization, the decrease density of ice, and its high polarity.
The primary homes of water are its polarity, concord, adhesion, floor anxiety, excessive unique warmth, and evaporative cooling. A water molecule is barely charged on each ends. this is because oxygen is more electronegative than hydrogen.
Water is good sized functionality to dissolve a ramification of molecules has earned it the designation of “standard solvent,” and it's far this capacity that makes water such an invaluable life-sustaining pressure. On a biological level, water's role as a solvent facilitates cells transport and use substances like oxygen or vitamins.
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Which of the following statements is correct?
Question 12 options:
In an acidic solution, [H+] > [OH-].
In a basic solution, [OH-] > [H+] .
In a neutral solution, [H+] = [OH-] .
All of the above statements are correct.
Answer:
All of the above statements are correct.
Explanation:
acid is a substance that acts as a proton donor, so will have more H+ ions;
basic/alkaline substances act as a proton acceptor, so will have more OH- ions according to bronsted lowry theory
and no to mention neutral means balanced so will have balanced concentration of ions to cancel their charges out.
What is the chemical symbol of the terminal atom in the lewis structure of OH- ?
Answer:
kindly refer to the picture attached
Explanation:
Have a great day . keep smiling
How many moles of Hydrogen gas will be produced if you start with 2.5 moles of Magnesium and an excess of Hydrochloric Acid given the following balanced chemical reaction:
Mg + 2HCl → MgCl2 + H2
Group of answer choices
A. 1.25 moles
B. 5.0 Moles
C. 7.5 moles
D. 2.5 moles
Taking into account the reaction stoichiometry, 1.25 grams of H₂ (option A) are formed if you start with 2.5 moles of Magnesium and an excess of Hydrochloric Acid.
Reaction stoichiometryIn first place, the balanced reaction is:
Mg + 2 HCl → MgCl₂ + H₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Mg: 1 mole HCl: 2 molesMgCl₂: 1 moleH₂: 1 moleMass of hydrogen formedThe following rule of three can be applied: if by reaction stoichiometry 2 moles of Mg form 1 mole of H₂, 2.5 moles of Mg form how many moles of H₂?
[tex]moles of H_{2} =\frac{2.5 moles of Mgx1 mole of H_{2} }{2 moles of Mg}[/tex]
moles of H₂= 1.25 moles
Finally, 1.25 grams of H₂ (option A) are formed if you start with 2.5 moles of Magnesium and an excess of Hydrochloric Acid.
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How many grams of Nitrogen gas are found in 22.4 L of Nitrogen gas?
Group of answer choices
A. 20 g
B. 14 g
C. 56 g
D. 28 g
Answer:
The answer is 28 gram.
28 gram of Nitrogen gas are found in 22.4 l in Nitrogen gas
The Haber process is a method to produce ammonia from hydrogen and nitrogen gases. The reaction is:
N2(g) + 3 H2(g) <--> 2 NH3(g)
If hydrogen gas is added after the reaction has reached equilibrium, the reaction will:
Group of answer choices
A. Need more information
B. Stop. All of the nitrogen gas has been used up.
C. Shift to the left to produce more reactants
D. Shift to the right to produce more product
Answer:
D.) Shift to the right to produce more product
Explanation:
When more reactants are added to a reaction, the equilibrium will shift to the product side to restore the balance.
As such, when H₂ (a reactant) is added, the reaction will shift to the product side, resulting in an increase of NH₃.
72
Anteaters have very long noses that are adapted to help them survive. Although they have poor eyesight,
anteaters have an excellent sense of smell that helps them detect their surroundings. Anteaters are also good
swimmers and can use their noses like a snorkel held above the water.
How does an anteater's nose help it meet its needs?
A
Its nose can be used to fight off predators.
B
C
D
Its nose can be used as a paddle to help it swim.
Its sticky tongue can quickly catch insects to eat.
Its powerful sense of smell helps it find insects to eat.
Answer:
Its powerful sense of smell helps it find insects to eat.
The value of the entropy change for the process N₂ (g) + 3H₂ (g) --> 2NH₃ (g) is ________.
positive
unchanged
zero
negative
Answer:
negative
Explanation:
Entropy is a measure of the "disorder" in a system.
In this reaction, the amount of disorder decreases. This is because one gas molecule (NH₃) has more order than two gas molecules (N₂ and H₂). Therefore, the entropy change should be negative.
Give the IUPAC name of 2,2,3-trimethyl butane and draw it's corrosponding structure.
I hope this helps you ...
What is the average dose of radiation that most people are exposed to every year not including dental or medical personnel dealing
with X-rays?
OA. 40 uSv
OB. 1000 u Sv
OC. 2400 u Sv
OD. 100,000 u Sv
C. The average dose of radiation that most people are exposed to every year not including dental or medical personnel dealing with X-rays is 2400 u Sv.
What is x-ray?
X-rays are a form of electromagnetic radiation, similar to visible light used for medical treatment and other forms of x ray inspection.
An X-ray, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation.
The average dose of radiation that most people are exposed to every year not including dental or medical personnel dealing with X-rays is 2400 u Sv or 2.4 m u Sv.
Thus, the average dose of radiation that most people are exposed to every year not including dental or medical personnel dealing with X-rays is 2400 u Sv.
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State which substance is undergoing oxidation and which substance is undergoing reduction in the following reaction:
Fe 3+ (aq) + SO3 2- (aq) ---> Fe 2+ (aq) + SO4 2- (aq)
Fe is undergoing oxidation while S is undergoing reduction
What is oxidation-reduction reaction?Oxidation-reduction reaction can simply be defined as a special type of chemical reaction in which the oxidation states of substrate change. Oxidation is the
So therefore, Fe is undergoing oxidation while S is undergoing reduction
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The empirical formula for a compound is C3H3O its molecular mass 110 what is its molecular formula
Answer:
C6H6O2
Explanation:
Total mass of empirical =55
Total mass of compound is 110. So you need to multiply each atims by 2
Find q when 22.0 g of water is heated from 29.0°C to 100.0°C.
Answer:
6530 J
Explanation:
To find the value of "Q", you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = energy/heat (J)
-----> m = mass (g)
-----> c = specific heat capacity (J/g°C)
-----> ΔT = change in temperature (°C)
The specific heat capacity of water is 4.182 J/g°C. You can plug the given values into the equation and solve for "Q". The final answer should have 3 significant figures because the lowest number of sig figs among the given values is 3.
Q = ? J c = 4.182 J/g°C
m = 22.0 g ΔT = 100.0 °C - 29.0 °C = 71.0 °C
Q = mcΔT
Q = (22.0 g)(4.182 J/g°C)(71.0 °C)
Q = 6530 J
Approximately 6461.9 joules of heat are required to heat 22.0 g of water from 29.0°C to 100.0°C.
Given:
mass of water, m = 22.0 g
Specific heat capacity of water, c = 4.184 J/g°C
Change in temperature, ΔT= 100.0°C - 29.0°C = 71.0°C
The formula for the heat absorbed or released during a temperature change:
q = m × c ×ΔT
where:
q = heat (in joules, J)
m = mass of the substance (in grams, g)
c = specific heat capacity of the substance (in J/g°C)
ΔT = change in temperature (in °C)
For water, the specific heat capacity is approximately 4.184 J/g°C.
Putting the values into the formula and calculating q:
q = 22.0 g × 4.184 J/g°C ×71.0°C
q ≈ 6461.9 J
Thus, approximately 6461.928 joules of heat are required.
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How many ml of 3M NaOH would it take to neutralize 120ml of 1M HCL?
Answer:
30ml
Explanation:
the acid-base solution just begins to turn pink and the pH reaches 7, indicating that the base has neutralized the acid. By reading the buret, it is found that 30 ml of NaOH was needed to neutralize the HCl.
Urgent
During an experiment, distilled water was placed in a sealed container and the container was heated gradually. Describe this system when it reaches phase equilibrium.
We can achieve equilibrium state, when the concentration of product and reactants are equal to each other.
Describe this system when it reaches phase equilibrium?
In this type of system, when the same amount of liquid water is converted into gaseous form of water and the gaseous form of water into liquid form of water. This phase is known as equilibrium phase or state because same amount of reactants and products are produced .
So we can conclude that we can achieve equilibrium state, when the concentration of product and reactants are equal to each other.
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Solve the following question
Answer:
140. J/g*K
Explanation:
To find the specific heat capacity, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = energy/heat (J)
-----> m = mass (g)
-----> c = specific heat (J/mole*K)
-----> ΔT = change in temperature (K)
Before you can use the equation above, you need to (1) convert kg to grams, then (2) convert grams to moles (via molar mass), and then (3) convert Celsius to Kelvin. The final answer should have 3 significant figures.
1.11 kg C₄H₈O₂ x 1,000 = 1110 g
Molar Mass (C₄H₈O₂): 4(12.01 g/mol) + 8(1.008 g/mol) + 2(16.00 g/mol)
Molar Mass (C₄H₈O₂): 88.104 g/mol
1110 grams C₄H₈O₂ 1 mole
------------------------------ x ------------------------- = 12.6 moles C₄H₈O₂
88.104 grams
34.5 °C + 273 = 307.5 K
52.3 °C + 273 = 325.3 K
Q = mcΔT <----- Equation
3.14 x 10⁴ J = (12.6 moles)c(325.3 K - 307.5 K) <----- Insert values
3.14 x 10⁴ J = (12.6 moles)c(17.8) <----- Subtract
3.14 x 10⁴ J = (224.28)c <----- Multiply 12.6 and 17.8
140. = c <----- Divide both sides by 224.28
**this answer may be slightly off due to using different molar masses/Kelvin conversions**
Determine the mass % of a NaCl solution if 58.5 grams of NaCl was dissolved in 50 ml of water (assume the density of water to be 1 g/ml). [5]
Considering the definition of percentage by mass and density, the percentage by mass of a NaCl solution is 53.917%.
Percentage by massThe percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:
[tex]percentage by mass= \frac{mass of solute}{mass of solution}x100[/tex]
DensityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
Percentage by mass of a NaCl solutionIn this case, you know:
mass of solute= 58.5 gramsvolume of water= 50 mLdensity of water= 1 [tex]\frac{g}{mL}[/tex]mass of solution= mass of solute + mass of waterReplacing in the definition of density, you get the mass of water:
[tex]1 \frac{g}{mL} =\frac{mass of water}{50 mL}[/tex]
Solving:
mass of water= 1 [tex]\frac{g}{mL}[/tex]× 50 mL
mass of water= 50 grams
Then, you get that the mass of solution is calculated as:
mass of solution= mass of solute + mass of water
mass of solution= 58.5 grams + 50 grams
mass of solution= 108.5 grams
So, the percentage by mass is calculated as:
[tex]percentage by mass= \frac{58.5 grams}{108.5 grams}x100[/tex]
percentage by mass= 53.917%
Finally, the percentage by mass of a NaCl solution is 53.917%.
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How many grams of water will be produced if you start with 4.0 grams of hydrogen and an excess of oxygen given the following balanced chemical equation?
2H2 + O2 → 2H2O
Group of answer choices
A. 32.0 grams
B. 36.0 grams
C. 54.0 grams
D. 18.0 grams
Taking into account the reaction stoichiometry, 36 grams of water (option B) will be produced if you start with 4.0 grams of hydrogen and an excess of oxygen.
Reaction stoichiometryIn first place, the balanced reaction is:
2 H₂+ O₂ → 2 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
H₂: 2 moles O₂: 1 moleH₂O: 2 molesThe molar mass of the compounds is:
H₂: 2 g/moleO₂: 32 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
H₂: 2 mole× 2 g/mole= 4 gramsO₂: 1 mole× 32 g/mole= 32 gramsH₂O: 2 moles× 18 g/mole= 36 gramsMass of H₂O formedYou can see that by reaction stoichiometry 4 grams of H₂ form 36 grams of H₂O.
SummaryIn summary, 36 grams of water (option B) will be produced if you start with 4.0 grams of hydrogen and an excess of oxygen.
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