7.8 Mass Calculations for Chemical Reactions

7.8 Mass Calculations for Chemical Reactions

When 1.2 moles of C and nitrogen are used, how many moles of CO are produced?

If 0.60 mole of NH3 is ethane, how many moles of N2 reacted?

• When we have a balanced chemical equation for a reaction, we can use the mass of one of the substances in the reaction to calculate the mass of another substance.

• The calculation requires us to convert the mass of A to moles of A using the molar mass of A.
• The converting Grams to Grams moles of A will be converted by this mole-mole factor.
• The grams of substance B are calculated using the molar mass of B.

• High temperatures are produced when acetylene is burned in oxygen.

• The given and needed quantities are stated.

• To convert the given to the needed quantity, write a plan.

• Write mole-mole factors using coefficients.

• Give the needed quantity by setting up the problem.

• When 25.0 g of O2 reacts, the grams of CO Try Practice Problems 7.59 to 7.66 2 can be pro duced.

• Nitrogen and water form when ammonia and oxygen react.

• There is a reaction between oxygen and sodium to produce sodium oxide.

How many grams of O2 is needed?

• Nitrogen gas reacts with hydrogen gas.