From the calculation, the partial pressure of Cl2 is 1.98 atm. Option B
What is the equilibrium constant?The term equilibrium constant refers to the value that shows us the extent to which reactants are converted into products. We know that the equilibrium constant can only be obtained by the use of the equilibrium partial pressures of each of the species.
Thus we have;
K = p PCl3 . pCl2/pPCl5
p PCl3 = partial pressure of PCl3
pCl2 = partial pressure of Cl2
pPCl5 = partial pressure of PCl5
K = equilibrium constant
Substituting values;
1.05 = 0.463 * pCl2/0.875
pCl2 = 1.05 * 0.875/0.463
pCl2 = 1.98 atm
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Using the periodic table, choose the more reactive non-metal.
S or As
Answer:
Sulfur
Explanation:
In general, elements are more reactive the more electronegative they are. The most electronegative elements are at the top-right of the periodic table. Since sulfur (S) is one unit up and one unit to the right of arsenic (As), it is considered more electronegative, and therefore more reactive, than arsenic.
Difference between jaanto and panighatta..
Answer:
they're both completely different games
Explanation:
Answer: uh.. tricky
Explanation:
the quantity PV/T must be held constant and both P and V are doubled, the value of T will necessarily have to,
Predict and Balance the following reaction:
Na + H2O →
Group of answer choices
A. 2Na + 2H2O → 2NaOH + H2
B. No Reaction Occurs
C. Na + H2O → NaOH2
D. 2Na + H2O → Na2O + H2
A. The balanced chemical reaction of Sodium metal and Water is 2Na + 2H₂O → 2NaOH + H₂.
What is a balanced chemical equation?A balanced equation contains the same number of each type of atoms on both the left and right sides of the reaction arrow.
Reaction of Sodium metal and WaterSodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2).
The balanced chemical reaction is written below;
2Na + 2H₂O → 2NaOH + H₂
Thus, the balanced chemical reaction of Sodium metal and Water is 2Na + 2H₂O → 2NaOH + H₂.
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The average energy consumption for a new Samsung refrigerator is 5.47 × 10 2 kWh/ye ar. What is the average energy consumption of this refrigerator in gigajoules per day? (Given 1 GJ = 277.8 kWh ) show work.
Answer:
Explanation:
'nsofikldng[ousgafi'fjsngds[sbuofdia
Using standard heats of formation, calculate the standard enthalpy change for the following reaction.
C2H4(g) + H2O(g) ------> CH3CH2OH(g)
The enthalpy change of the reaction is -44.79 kJ/mol.
What is the enthalpy change?We can define the enthalpy change as the energy that is given out or taken in in a reaction. it can be calculated from the enthalpies of formation of species by the use of the relation;
ΔH = ∑Enthalpy of formation of products - ∑Enthalpy of formation of reactants
ΔHfC2H4(g) = +52kJ/mol
ΔHf H2O(g) = - 241.82 kJ/mol
ΔHf CH3CH2OH(g)= -234.61 kJ/mol
ΔHrxn = (-234.61) - [52 + (- 241.82 )]
ΔHrxn = (-234.61) - (-189.82)
ΔHrxn = -44.79 kJ/mol
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How many moles of NaOH are in a 356 mL solution that has a concentration of 7.2 M?
Answer:
2.56 moles
Explanation:
7.2 M is 7.2 moles/L
356 mL = .356 Liters
x moles / .356 Liters = 7.2 M (moles/L)
x = .356 * 7.2 = 2.5632 moles
A 34.4 L sample of oxygen gas at 229°C and 752 torr is cooled to 34°C at 668 torr. The volume of the sample is now
L.
Answer:
23.55 L
Explanation:
USe the following 'identity' of gs laws
P1 V 1 / T1 = P2 V2 / T2 ( T must be in Kelvin)
re arrange to
P1 V 1 T2 / (T1 P2) = V2 NOW SUB IN THE VALUES
752 * 34.2 * ( 34 + 273.15) / [( 229 + 273.15) * 668] = V2 = 23.55 L
2Al(s)+Fe2O3(s) → Al2O(s)+2Fe(s) with a delta H=-847 KJ.
Railroad maintenance initiates a thermite reaction of 4.0 mol Al to connect two lengths of rail using the reaction above. How much heat is released during the reaction?
∆H for given reaction -847kJ
As it's negative reaction is exothermicSo
2 mol of Al releases 847KJ heat
4 mol Al releases
2(847)1694KJ∆H=-1694KJ
It is given that the energy released during the reaction of 2 moles of Al metal is - 847 KJ. The n the heat energy released by 4 moles of Al will be - 1694 KJ.
What is reaction enthalpy?The enthalpy change of a reaction is the heat energy absorbed or released by a reaction. For an endothermic reaction, the heat energy is absorbed and the enthalpy change is positive. For an exothermic reaction, where the energy is released, the enthalpy change will be negative.
The heat energy change during a reaction is equal to the product of mass, specific heat and temperature difference of the substanc eunder reaction or phase transition.
Given that, the heat evolved by 2 moles of Al is - 847 kJ. Then, the heat evolved when 4 moles of Al reacted is calculated as follows:
(4 × - 847) / 2 = - 1694 KJ.
Therefore, the heat energy released is - 1694 KJ.
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A piece of copper absorbs 5000 J of energy and undergoes a temperature change from 100 °C to 200 °C. What is the mass of the piece of copper?
Group of answer choices
A. 12.9 grams
B. 129.9 grams
C. 0.385 grams
D. 1290 grams
Answer:
B.) 129.9 grams
Explanation:
To find the mass, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = energy (J)
-----> m = mass (g)
-----> c = specific heat (J/g°C)
-----> ΔT = change in temperature (°C)
The specific heat of copper is 0.385 J/g°C. Knowing this, you can plug the given values into the equation and simplify to isolate "m".
Q = mcΔT <----- Equation
5000 J = m(0.385 J/g°C)(200 °C - 100 °C) <----- Insert values
5000 J = m(0.385 J/g°C)(100) <----- Subtract
5000 J = m(38.5) <----- Multiply 0.385 and 100
129.9 = m <----- Divide both sides by 38.5
What is the equilibrium constant for the reaction
Answer:
B.) [tex]K_{eq} = \frac{[SO_3][NO]}{[SO_2][NO_2]}[/tex]
Explanation:
The general equilibrium expression looks like this:
[tex]K_{eq} = \frac{[C]^c[D]^d}{[A]^a[B]^b}[/tex]
In this expression,
-----> K = equilibrium constant
-----> uppercase letters = formulas
-----> lowercase letters = balanced equation coefficients
The products are in the numerator and the reactants are in the denominator. Since all of the molecules are gases, they should all be included in the expression. Since the coefficients in the balanced equation are all 1, they do not need to be represented in the expression.
The equilibrium constant expression is:
[tex]K_{eq} = \frac{[SO_3][NO]}{[SO_2][NO_2]}[/tex]
Determine the concentration of a solution (M) made by dissolving 18.8 g of sodium chloride (NaCl) in 750.0 mL of solution.
Answer:
0.429 M
Explanation:
To find the molarity, you need to (1) convert grams to moles (using the molar mass), then (2) convert mL to L, and then (3) calculate the molarity (using the molarity ratio).
(Step 1)
Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol
Molar Mass (NaCl): 58.443 g/mol
18.8 grams NaCl 1 mole
-------------------------- x ------------------------ = 0.322 moles NaCl
58.443 grams
(Step 2)
1,000 mL = L
750.0 mL 1 L
------------------ x ----------------- = 0.7500 L
1,000 mL
(Step 3)
Molarity (M) = moles / volume (L)
Molarity = 0.332 moles / 0.7500 L
Molarity = 0.429 M
Magnesium metal burns with a bright white light . At the end of the reaction , white magnesium oxide powder is produced . Suggest why magnesium is often found in fireworks . Your answer should include a word equation .
The element magnesium is often in fireworks because it burns with bright white light. It adds white sparks and hence, improves the overall brilliance of a firework.
Properties of Magnesium Magnesium metal and its alloys are explosive in nature. They are highly flammable in pure form, powder form, or ribbon formMagnesium reacts violently with waterWhen magnesium metal is burned it reacts with the oxygen present in the air. Magnesium and oxygen react with each other to form magnesium oxide which is a white powder. Magnesium gives its 2 electrons to the oxygen to form this powdered product.The reaction is as follows:
[tex]2Mg (s) + O_2 (g) \rightarrow 2MgO(s) + energy[/tex]
The reaction is exothermic in nature.
It can also reduce water to H₂ gas[tex]Mg(s)+ 2H_2O \rightarrow Mg(OH)_2(s) + H_2 (g)[/tex]
Magnesium reacts with carbon dioxide to form carbon[tex]Mg(s)+CO_2 \rightarrow 2MgO(s)+ C(s)[/tex]
As magnesium is highly flammable and burns with white bright light, hence it is used in fireworks to improve its overall experience.
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For the following questions state the oxidation number of the element in the given compound.
1. sul fur in Li2SO#3
2. chlorine in MgCl2
3.Silicon in SiO2
4.sul fur in H2SO4
5.Sulfur in SO4^2-
6. manganese in MnO4^-
7. Cr in Cr2O7^2-
in the periodic tables
elements in the same column have the same charge
in a compound oxidation numbers have to equal 0
1.
sulfur in Li2SO3
charges :
Li = +1 S = +4 O = -2
multiply the charge with the subscripted number next to the element
Li = +1
Li2 = +2
O = -2
O3 = -8
in a compound oxidation numbers have to equal 0
+2 S -6 = 0
S -4 = 0
S = +4
Sulfur = +4
2.
MgCl2
Mg = +2
+2 Cl2 = 0
Cl2 = -2
Cl by itself = -2 divided by 2 = -1
Chlorine = -1
3.
SiO2
Silicon = +4
4.
Sulfur in H2SO4
H: +1 S: +6 O: -2
H2SO4
H2 : +2 O4: -8
+2 +S -8 = 0
S - 6 = 0
S = +6
Sulfur = +6
5.
Sulfur in SO4^2-
Sulfur in SO4
Sulfur = +4
6.
Manganese in MnO4^-
Manganese in MnO4
Manganese = +4
7.
Cr2O7^2-
Dichromate
Cr in Cr2O7^2- or Cr2O7-2-
Cr: +6 O: -2
Which of these have the highest volume
A. - 1kg of lead
B. - 1kg of iron
C. - 1kg of gold
D. - 1kg of aluminum
Answer:
D. 1kg Aluminium
Explanation:
First of all, you have to know that you were given two quantities, volume and mass.
The relationship between both quantities is given by the formula of density which is:
Density = Mass / Volume
Volume = Mass / Density
Since mass is constant, it means that the volume is inversely proportional to the density.
Volume = k / Density where k is a constant.
This means that the substance with the lowest density would have the highest volume and the one with the highest density would have the highest lowest.
The density of the substances are given as:
Lead = 11.2
Iron = 7.874
Gold = 19.3
Aluminium = 2.7
This means that Aluminium would have the highest volume as its the least dense.
Prform the following operation and express the answer in scientific notation 6.0 x 10^3-2.310^3
The value 6.0 x 10^3- 2.3 × 10^3 in scientific notation is 3.7 × 10^3.
What is scientific notation?Scientific notation is a way to write very large or very small numbers so that they are easier to read and work with.
You express a number as the product of a number greater than or equal to 1 but less than 10 and an integral power of 10 .
Why it is used?There are two reasons to use scientific notation.
The first is to reveal honest uncertainty in experimental measurements. The second is to express very large or very small numbers so they are easier to read.Given,
= 6.0 x 10^3- 2.3 × 10^3
= (6.0 - 2.3) × 10^3
= 3.7 × 10^3
Thus, we find that the value 6.0 x 10^3- 2.3 × 10^3 in scientific notation is 3.7 × 10^3.
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Given the following reaction: 2 NO(g) + O2(g) <--> 2 NO2(g), what is the equilibrium constant (K), if the concentrations at equilibrium are [NO] = 0.0542 M, [O2] = 0.127 M, and [NO2] = 15.5 M?
Group of answer choices
A. K = 2.35 x 102
B. K = 2.54 x 10-1
C. K = 6.44 x 105
D. K = 3.4 x 103
The equilibrium constant of a reaction, [tex]K_{c}[/tex] = 6.44 * 10⁵; option C.
What is equilibrium constant of a reaction?Equilibrium constant, [tex]K_{c}[/tex] of a reaction is a measure of the ratio of the equilibrium concentration of the products of a reaction, to the equilibrium concentration of the reactants; with each concentration raised to the exponent corresponding to the coefficient in the balanced equation of the reaction.
[tex]K_{c} = \frac{(products)^{a}}{(reactants)^{b}}[/tex]
The balanced equation of the given reaction is as follows:
2 NO (g) + O₂ (g) ⇄ 2 NO₂ (g)The concentrations at equilibrium of the species are as follows:
[NO] = 0.0542 M,
[O₂] = 0.127 M, and
[NO₂] = 15.5 M
Equilibrium constant, [tex]K_{c}[/tex] = (15.5)²/(0.127) * (0.0542)²
[tex]K_{c}[/tex] = 6.44 * 10⁵
In conclusion, the equilibrium constant of a reaction, tells on in which direction, the reaction is favored at equilibrium.
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What volume of hydrogen (in L) is produced
from the complete reaction of 56.49 g of
magnesium metal at STP?
(Mg = 24.30 g/mol)
Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)
Hint: 1 mole of gas at STP occupies 22.4 L
Answer:
52.07 L H₂
Explanation:
Before you can find the volume of H₂, you need to find the moles of H₂. To do this, you need to (1) convert grams Mg to moles (via the atomic mass) and then (2) convert moles Mg to moles H₂ (via the mole-to-mole ratio from equation coefficients).
Atomic Mass (Mg): 24.30 g/mol
1 Mg(s) + 2 HCl(aq) ---> MgCl₂(aq) + 1 H₂(g)
^ ^
56.49 g Mg 1 mole 1 mole H₂
------------------- x ----------------- x -------------------- = 2.32 moles H₂
24.30 g 1 mole Mg
Now that you know the moles of H₂, you need to determine the volume at STP. To do this, you need to set up a proportion comparing the mole value versus the volume. Then, you can cross-multiply to solve for the unknown volume. The final answer should have 4 sig figs to match the given values.
1 mole 2.32 moles
-------------- = -------------------- <----- Set up proportion
22.4 L ? L
(1 mole) x ? L = 52.07 <----- Cross-multiply
? L = 52.07 <----- Divide both sides by 1 mole
What is the component concentration ratio, [CH3COO−]/[CH3COOH], of a buffer that has a pH of 4.650? (Ka of CH3COOH = 1.8 × 10−5)
Answer:
Refer to the attached page,
I've done the calculation over there
write three disadvantages of hard water.
The three disadvantages of hard water are:
1. Hard water is unsuitable for washing because soap does not readily create a lather in it.
2. Soap may react and produce, wasting the soap.
3. Due to the development of calcium and magnesium carbonates, tea kettles will get furred.
Hard waterWater that contains a lot of minerals is referred to as hard water. In limestone, chalk, or gypsum deposits, which are mostly composed of calcium and magnesium carbonates, bicarbonates, and sulphates, hard water is created as a result of percolation. A moderate health advantage from drinking hard water is possible. In industrial settings where water hardness is regulated to prevent expensive breakdowns in boilers, cooling towers, and other water-handling equipment, it can present serious issues. Hard water is frequently detected in home settings by the build-up of lime scale in kettles and water heaters as well as by the absence of foam when soap is agitated in water. Wherever there is a worry about water hardness, water softening is frequently employed to lessen the negative impacts of hard water.
write three disadvantages of hard water.
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How many molecules of H₂S are required to form 79.0 g of sulfur according to the following reaction? Assume excess SO2.
2 H₂S(g) + SO2(g) → 3 S(s) + 2H₂O(1)
Answer:
9.89 x 10²³ molecules H₂S
Explanation:
To find the molecules of H₂S, you need to (1) convert grams S to moles S (via the atomic mass of sulfur), then (2) convert moles S to moles H₂S (via the mole-to-mole ratio from equation coefficients), and then (3) convert moles H₂S to molecules H₂S (via Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value.
Atomic Mass (S): 32.065 g/mol
2 H₂S(s) + SO₂(g) -----> 3 S(s) + 2 H₂O(l)
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
79.0 g S 1 mole 2 moles H₂S 6.022 x 10²³ molecules
--------------- x --------------- x ---------------------- x ------------------------------------- =
32.065 g 3 moles S 1 mole
= 9.89 x 10²³ molecules H₂S
Which of the following IS a part of the Kinetic Molecular Theory (KMT)?
Group of answer choices
A. Molecules in a gas move slowly.
B. Molecules in a gas move rapidly.
C. Molecules have HUGE volumes.
D. Molecules have predictable motions.
The statement that is a part of Kinetic Molecular Theory (KMT) is Molecules in a gas move rapidly. That is option B.
What is Kinetic Molecular Theory (KMT)?Kinetic Molecular Theory (KMT) is defined as the theory that describes the physical behaviour of gases.
The Kinetic Molecular Theory (KMT) include the following:
Ideal gas molecules are constantly moving; They have negligible volume;They have negligible intermolecular forces; They undergo perfectly elastic collisions; and They have an average kinetic energy proportional to the ideal gas's absolute temperature.Therefore, the statement that is a part of Kinetic Molecular Theory (KMT) is Molecules in a gas move rapidly.
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the weak ionization constant (Ka) for HNO2 is equal to:
Answer:
the answer is A
Explanation:
The weak ionization constant (Ka) for HNO₂ is:
[tex]\displaystyle K_a = \frac{[H^+][NO_2^-]}{HNO_2}[/tex]
What is the ionization constant?Acid-ionization constant Ka can be described as a quantitative measure of the strength of an acid in solution. It can be represented as the equilibrium constant for a chemical reaction:
[tex]{\displaystyle {\ce {HA \longrightarrow A^- + H^+}}}[/tex]
The chemical species HA can dissociate into A⁻ the conjugate base of the acid and a hydrogen ion, H⁺. In equilibrium, when the concentrations will not change over time, because both forward and backward reactions have the same rate.
The ionization constant can be described as the ratio of products and reactants raised to stoichiometric powers.
The dissociation constant is defined as:
[tex]{\displaystyle K_{\text{a}}=\mathrm {\frac {[A^{-}][H^{+}]}{[HA]}} }[/tex]
Given the dissociation of the HNO₂ as follows:
HNO₂ ⇄ H⁺ + NO₂⁻
The weak ionization constant (Ka) for HNO₂ is equal to:
[tex]\displaystyle K_a = \frac{[H^+][NO_2^-]}{[HNO_2]}[/tex]
Therefore, option A is correct.
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If the pressure is doubles and the temperature is held constant what will happen to the volume of a gas?
Group of answer choices
A. Quadrupled
B. Doubled
C. Reduced by Half
D. Reduced by a Fourth
Answer:
C
Explanation:
Of course increasing the pressure will reduce the volume
P1V1 = P2V2
P1V1/P2 = V2 WHEN P2 = 2 P1----multiply both sides by 1/2
P1 V1 / 2P1 = 1/2 V2 <===== 1/2 the original
Calculate the molality of a 5.51 M ethanol (C2H5OH) solution whose density is 0.9349 g/mL
Molality of C2H5OH is 1.1.27m.
What is Molality?
Molality is no.of moles present in One Kg solution .
Molality is represented by m
m= no.of moles/ weigt of solution in kg
Given is Molarity= 51.30M
molar mass of C2H5OH is 46g / mol , Density =0.9349g/ ml
Density=m/V
V = 107 ml
Molarity= no of moles/ Volume
51.5×46×107= x × 1000
weight of C2H5OH = 27.7g
molality = 27.7/1000××46
m= 1.27m
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What would the hydroxide ion concentration be if the hydrogen ion concentration was 1 x 10-3 M?
Answer:
1 x 10⁻¹¹ M
Explanation:
(Step 1)
Determine the pH.
pH = -log[H⁺]
pH = -log[1 x 10⁻³ M]
pH = 3
(Step 2)
Determine the pOH.
pH + pOH = 14
3 + pOH = 14
pOH = 11
(Step 3)
Determine the hydroxide (OH⁻) concentration.
[OH⁻] = 10^-pOH
[OH⁻] = 10⁻¹¹
[OH⁻] = 1 x 10⁻¹¹ M
Which of the following best describes the interaction between water molecules?
Group of answer choices
A. Hydrogen Bonding
B. London Dispersion Forces
C. Dipole-Dipole Forces
D. Van der Waals Forces
Answer:
hydrogen bonding
Explanation:
I just think it is I am not sure
Answer: C. Dipole-dipole interactions.
Which would be the best way to represent the concentration of a 1.75 M K2CrO4 solution?
O 1.75% K2CrO4
O [K2CRO4]
(K2CrO4)
K2CRO4, [M] = 1.75
The best way to represent the concentration of a 1.75 M K2CrO4 solution is 1.75% K2CrO4 (option A).
What is molarity?Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
The molarity is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.
The molarity is measured in mol/L or M, hence, it can be said that the molarity of a solution is 0.1M.
However, the concentration of a solution is best represented by using %. In accordance with this question, the best way to represent the concentration of a 1.75 M K2CrO4 solution is 1.75% K2CrO4.
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Help me asap please !
Answer:
15 is not a correct scientific measurement.
Explanation:
Is this helpful for You
1. Consider the unbalanced equation:
Al4C3 (s) + H2O (l) ---> Al(OH)3 (s) + CH4 (g)
How many moles of H2O are needed to react with 1.48 moles of Al4C3 ?
Hint: Write the balanced equation first
2.
Consider the balanced equation:
2 CH4 (g) + 3 O2 (g) + 2 NH3 ---> 2 HCN (g) + 6 H2O (g)
If 203.6 g of NH3 is reacted with excess CH4 and O2, what mass in grams of HCN is produced?
Answer:
1.) 17.76 moles H₂O
2.) 323.1 g HCN
Explanation:
1.) An equation is balanced when there is an equal amount of each element on both sides of the reaction. The quantities can be modified by adding coefficients in front of the molecules.
The unbalanced equation:
Al₄C₃(s) + H₂O -----> Al(OH)₃(s) + CH₄(g)
Reactants: 4 aluminum, 3 carbon, 2 hydrogen, 1 oxygen
Products: 1 aluminum, 1 carbon, 7 hydrogen, 3 oxygen
The balanced equation:
Al₄C₃(s) + 12 H₂O -----> 4 Al(OH)₃(s) + 3 CH₄(g)
Reactants: 4 aluminum, 3 carbon, 24 hydrogen, 12 oxygen
Products: 4 aluminum, 3 carbon, 24 hydrogen, 12 oxygen
Now that the equation is balanced, you can use the relevant coefficients to construct a mole-to-mole ratio. This will allow you to convert between moles Al₄C₃ to moles H₂O.
1.48 moles Al₄C₃ 12 moles H₂O
---------------------------- x ------------------------ = 17.76 moles H₂O
1 mole Al₄C₃
2.) To find the mass of HCN, you need to (1) convert grams NH₃ to moles NH₃ (via molar mass), then (2) convert moles NH₃ to moles HCN (via mole-to-mole from equation coefficients), and then (3) convert moles HCN to grams HCN (via molar mass). It is important to arrange the coefficients in a way that allows for the cancellation of units.
Molar Mass (NH₃): 14.009 g/mol + 3(1.008 g/mol)
Molar Mass (NH₃): 17.033 g/mol
Molar Mass (HCN): 1.008 g/mol + 12.011 g/mol + 14.009 g/mol
Molar Mass (HCN): 27.028 g/mol
2 CH₄(g) + 3 O₂(g) + 2 NH₃(g) ------> 2 HCN(g) + 6 H₂O(g)
203.6 g NH₃ 1 mole 2 moles HCN 27.028 g
--------------------- x ---------------- x ------------------------ x ----------------- =
17.033 g 2 moles NH₃ 1 mole
= 323.1 g HCN