1. Molarity and Stoichiometry

2. 1. Calculate the number of grams of sodium carbonate that are required to react fully with mL of M HCl.
Na2CO3(aq) HCl (aq) → NaCl (aq) H2O (l) CO2(g)
? g
0.125L
0.125L HCl
x mol
x 1 mol Na2CO3
x g
= g Na2CO3 1L
2 mol HCl
1 mol

3. 2. How many milliliters of 0
2. How many milliliters of M hydrochloric acid are needed to produce 3.4 L of sulphur dioxide gas at STP?
Na2SO3 (aq) HCl (aq) → 2NaCl (aq) H2O (l) + SO2(g)
? mL
3.4 L
3.4 L SO2
x 1 mol
x 2 mol HCl
x L
x mL
22.4 L
1 mol SO2
0.698 mol 1L
= x 102 mL

4. 3. What volume of 0. 300 M KOH will neutralize 100. 0 mL of 0
3. What volume of M KOH will neutralize mL of M H2SO4
1 H2SO KOH → HOH K2SO4 L
? L
L H2SO4
x mol
x 2 mol KOH
x 1L 1L
1 mol H2SO4
0.300 mol
= L of KOH

5. 4. 13. 8 L of CO2 @ STP is dissolved in 250. 0 mL of water
L of STP is dissolved in mL of water. What is the molarity of the resulting solution?
13.8 L CO2
x mol
22.4 L
Molarity =
0.250 L
= M
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