Chemistry College

The following series of reactions were carried out.
PbCO3(s) + 2HNO3(aq) → Pb(NO3)2(aq) + H₂O(1) + CO₂(g)
Pb(NO3)2(aq) + 2HBr(aq) → 2HNO3(aq) + PbBr2(s)
(a) If a student starts with 2.457 g of lead(II) carbonate for the first reaction and all
other reagents are added in excess, what is the theoretical yield of lead(II) bromide
solid?

Answers

Answer 1
To find the theoretical yield of lead(II) bromide (PbBr2) solid, we need to determine the limiting reactant in the given reaction sequence. The limiting reactant is the one that is completely consumed and determines the maximum amount of product that can be formed.

First, let's calculate the molar mass of PbCO3:
PbCO3: Pb (207.2 g/mol) + C (12.0 g/mol) + 3O (16.0 g/mol) = 267.2 g/mol

Next, we can calculate the number of moles of PbCO3:
moles = mass / molar mass = 2.457 g / 267.2 g/mol ≈ 0.00919 mol

From the balanced equation, we can see that the mole ratio between PbCO3 and PbBr2 is 1:1. Therefore, the moles of PbBr2 formed will be the same as the moles of PbCO3 used.

The molar mass of PbBr2 is:
PbBr2: Pb (207.2 g/mol) + 2Br (2 × 79.9 g/mol) = 366.0 g/mol

Now, we can calculate the theoretical yield of PbBr2:
theoretical yield = moles of PbBr2 × molar mass of PbBr2
= 0.00919 mol × 366.0 g/mol
≈ 3.36 g

Therefore, the theoretical yield of lead(II) bromide (PbBr2) solid is approximately 3.36 grams.

Related Questions


What would be the formula of the compound that forms between Al and S?
a) AIS
b) Al₂S
c) AIS2
d) Al3S2
e) None of the above

Answers

The correct formula for the compound that forms between aluminum (Al) and sulfur (S) is (d) Al₂S₃.

The correct option is E, none of the above.

What is the nature of the reaction between Al and S?

The reaction between aluminum (Al) and sulfur (S) is an example of a chemical reaction known as a combination or synthesis reaction. In this reaction, aluminum and sulfur combine to form a

.

The chemical equation for the reaction is:

2Al + 3S → Al₂S₃

Aluminum has a 3+ charge (Al³⁺) and sulfur has a 2- charge (S²⁻). In order to balance the charges, two aluminum ions (Al³⁺) are needed to combine with three sulfur ions (S²⁻), resulting in the formula Al₂S.

Learn more about compounds at: https://brainly.com/question/14782984

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