REVIEW WORKSHEET: 12-1 ARITMETIC OF EQUATIONS
Vocab:
Stoichiometry- the calculation of quantities in a chemical reaction
Practice questions:
1) An apple pie needs 10 large apples, 2 crusts ( top and bottom) and 1 tablespoon
of cinnamon Write a balanced equation that fits the situation. How many apples are
needed to make 25 pies?
2 Interpret equation in terms of molecules, moles, masses of reactants and
products and volumes of gases at STP.
2H2(g) + 02  2H2O(g)
3) Balance the following Equation.
C2H2 (g) + O2 (g)  CO2 (g) + H2O(g)
Interpret the balanced equation in terms of moles, volume of gas at STP and
masses of reactants and products.
4)Interpret the given equation in terms of representative particles, numbers of mols
and masses of reactants and products.
2K(s) + 2H2O (l)  2KOH (aq) +H2 (g)
5. Interpret into mols and gas at STP
Fe2O3 + H2O (S) + 3CO (g)  2Fe (s) +3CO2(g) + H2O (g)
6) Two moles of potassium chloride and three moles of oxygen are produced from
the decomposition of two moles of potassium chlorate KCLO3 (s). Write the
balanced equation. How many moles of oxygen are produced from 12 moles of
potassium chlorate.
7) Using the equation from problem 6, how many moles of oxygen are produced
from14 moles of potassium chlorate?
8) Two molecules of hydrogen react with one molecule of oxygen to produce 2
molecules of water. How many moles of water are produced from 22.5 moles of
oxygen?
9) Interpret the following equation using moles, molecules, and volumes (assume
STP). Compare the mass of the reactants to the mass of the product.
2N2(g) �3O2(g)y2N2O3(g)
10) How many moles of chlorine gas will be required to react with sufficient iron to
produce 14 moles of iron(III) chloride?
2Fe(s) �3Cl2(g) y2FeCl3(g)