# Worksheet 2C: Stoichiometry


## Q1.

$$Na_2SiO_3 (s) + 8 HF_{(aq)} \rightarrow H_2SiF_{6\; (aq)} + 2 NaF_{(aq)} + 3 H_2O_{(l)}$$

1. How many moles of $$HF$$ are needed to react with 0.300 mol of $$Na_2SiO_3$$?
2. How many grams of $$NaF$$ form when 0.500 mol of $$HF$$ reacts with excess $$Na_2SiO_3$$?
3. How many grams of $$Na)2SiO_3$$ can react with 0.800 g of $$HF$$?

## Q2.

$$C_6H_{12}O_{6\; (aq)} \rightarrow 2 C_2H_5OH_{(aq)} + 2 CO_{2\; (g)}$$

1. How many moles of $$CO_2$$ are produced when 0.400 mol of $$C_6H_{12}O_6$$ reacts in this fashion?
2. How many grams of $$C_6H_{12}O_6$$ are needed to form 7.50 g of $$C_2H_5OH$$?
3. How many grams of $$CO_2$$ form when 7.50 g of $$C_2H_5OH$$ are produced?

## Q3.

$$Fe_2O_{3\; (s)} + CO_{(g)} \rightarrow Fe_{(s)} + CO_{2\; (g)}$$ (unbalanced!)

1. Calculate the number of grams of $$CO$$ that can react with 0.150 kg of $$Fe_2O_3$$
2. Calculate the number of grams of $$Fe$$ and the number of grams of $$CO_2$$ formed when 0.150 kg of $$Fe_2O_3$$ reacts

## Q4.

$$2 NaOH_{(s)} + CO_{2\;(g)} \rightarrow Na_2CO_{3\; (s)} + H_2O_{(l)}$$

1. Which reagent is the limiting reactant when 1.85 mol NaOH and 1.00 mol $$CO_2$$ are allowed to react?
2. How many moles of $$Na_2CO_3$$ can be produced?

## Q5.

$$C_6H_6 + Br_2 \rightarrow C_6H_5Br + HBr$$

1. What is the theoretical yield of $$C_6H_5Br$$ in this reaction when 30.0 g of $$C_6H_6$$ reacts with 65.0 g of $$Br_2$$?
2. If the actual yield of $$C_6H_5Br$$ was 56.7 g, what is the percent yield?

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