Stoichiometry and Chemical Equations (3.3.2)

Question 1

• Balanced chemical equations relate reactants and products in moles.

Answer 1

• Balanced chemical equations relate reactants and products in moles.

Question 2

• Molar ratios from balanced chemical equations can be used as conversion factors.

Answer 2

• Molar ratios from balanced chemical equations can be used as conversion factors.

Question 3

Balanced chemical equations relate reactants and
products in moles.

The coefficients in a balanced chemical equation
represent whole number ratios of reactants to
products. In this example, 1 mole of nitrogen gas
(N2) reacts with 3 moles of hydrogen gas (H2) to
produce 2 moles of ammonia (NH3).

Answer 3

Balanced chemical equations relate reactants and
products in moles.

The coefficients in a balanced chemical equation
represent whole number ratios of reactants to
products. In this example, 1 mole of nitrogen gas
(N2) reacts with 3 moles of hydrogen gas (H2) to
produce 2 moles of ammonia (NH3).

Question 4

The balanced chemical equation can be used to
convert moles of one reagent to moles of another
reagent.

For example, 9.4 moles of nitrogen can produce 19
moles of ammonia, while 13.3 moles of nitrogen can
produce 26.6 moles of ammonia.

Answer 4

The balanced chemical equation can be used to
convert moles of one reagent to moles of another
reagent.

For example, 9.4 moles of nitrogen can produce 19
moles of ammonia, while 13.3 moles of nitrogen can
produce 26.6 moles of ammonia.

Question 5

The balanced chemical equation can also be used
to convert grams of one reagent to grams of another
reagent.

Problem: How many grams of hydrogen gas are
needed to react with 53.1 grams of nitrogen gas?

First, convert grams of nitrogen gas to moles of
nitrogen gas by using the molar mass of nitrogen
gas.

Second, convert moles of nitrogen gas to moles of
hydrogen gas by using the balanced chemical
equation.

Finally, convert moles of hydrogen gas to grams of
hydrogen gas by using the molar mass of hydrogen
gas.

Answer 5

The balanced chemical equation can also be used
to convert grams of one reagent to grams of another
reagent.

Problem: How many grams of hydrogen gas are
needed to react with 53.1 grams of nitrogen gas?

First, convert grams of nitrogen gas to moles of
nitrogen gas by using the molar mass of nitrogen
gas.

Second, convert moles of nitrogen gas to moles of
hydrogen gas by using the balanced chemical
equation.

Finally, convert moles of hydrogen gas to grams of
hydrogen gas by using the molar mass of hydrogen
gas.