Stoichiometry--Mixed Problems

Front

What is stoichiometry?

Back

Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the conservation of mass.

Front

Define mole ratio.

Back

A mole ratio is a ratio that relates the amounts in moles of any two compounds involved in a chemical reaction.

Front

True or False: A mole ratio is always written with the larger number in the denominator.

Back

False

Front

What is the balanced equation for the formation of phosphorus trifluoride?

Back

P4 (s) + 6 F2 (g) → 4 PF3 (g)

Front

How do you calculate the mass of a reactant needed in a reaction?

Back

Use the mole ratio from the balanced equation and the molar mass of the reactants.

Front

If 6.20 g of phosphorus reacts, how many grams of fluorine are needed?

Back

11.4 g F2 are needed.

Front

What is the molar mass of C5H8?

Back

The molar mass of C5H8 is approximately 68.1 g/mol.

Front

How many grams of C5H8 form from 5.45 moles of C5H12?

Back

371 g C5H8 form.

Front

What is the total number of moles of water needed to make 2.5 moles of C6H12O6?

Back

15 moles of water are needed.

Front

What is the balanced equation for the reaction of zinc with hydrochloric acid?

Back

Zn + 2 HCl → ZnCl2 + H2