Chapter 4

Sodium metal and chlorine gas can be produced by the electrolysis of molten sodium chloride as shown in the following equation: 2NaCl(l) → 2Na(l) + Cl2(g) What mass of Na in grams would be produced from 10.00 g of NaCl?

3.934 g

Consider the following general reaction where M is an alkali metal and X is a halogen: 2M + X2 → 2MX This reaction could be used to predict the equation for which of the following reactions?

lithium and bromine

One pizza can be prepared from the following recipe: 1 crust + 5 ounces tomato sauce + 2 cups cheese + 15 pieces of pepperoni → 1 pizza How many pizzas can be made if you start with 4 crusts, 30 ounces of tomato sauce, 10 cups of cheese, and 45 pieces of pepperoni?

three pizzas

Balance the equation for the formation of ammonia from hydrogen gas and nitrogen gas using a set of the lowest possible integer coefficients. What is the coefficient in front of ammonia, NH3, in the balanced equation? N2 (g) + H2 (g) → NH3 (g)

2

The following unbalanced equation illustrates the overall reaction by which the body utilizes glucose to produce energy: C6H12O6(s) + O2(g) → CO2(g) + H2O(l) What is the conversion factor that allows for the calculation of moles of carbon dioxide based on moles of glucose?

6 mol CO2 / 1 mol C6H12O6

Propane, C3H8, a fuel used in many outdoor grills, burns in oxygen to produce carbon dioxide gas, CO2, and water vapor, H2O, as shown in the reaction below. If 2.0 mol of propane are burned (reacted with oxygen), how many moles of carbon dioxide will be produced? C3H8 (g) + 5 O2(g) → 3 CO2 (g) + 4 H2O (g)

6.0 mol CO2

A student calculates that 52.5 g of product can be prepared from a given set of initial amounts of the reactants. The student then goes into the lab, performs the experiment, and produces 48.2 g of product. What is the percent yield?

91.8%

If 3.50 mol of Fe reacts with 3.00 mol of oxygen in the following reaction: 4 Fe(s) + 3 O2(g) → 2 Fe2O3(s) which of the following statements is correct?

Fe is the limiting reactant, and 1.75 mol of product can be produced.

The basic principle in balancing a chemical equation is to ______.

have the same number of atoms of each element in the reactants and in the products

Which of the following statements is MOST likely correct relating to greenhouse gases?

The increase in average temperature of Earth's atmosphere parallels the increase in carbon dioxide concentration.