Gas Laws Homework Iii

Name: ______________________________ Block: _____

Gas Laws III: Stoichiometry Complete all problems as directed, making sure to show your work. As always, NO WORK = NO CREDIT.

1.

Limestone is dissolved by CO2 and water according to the equation CaCO3(s) + H2O(l) + CO2(g)  Ca(HCO3)2(aq) a. How many mol of CO2 are required to dissolve 115 g of CaCO3

b. What is the volume of the CO2 that you calculated in part (a) at STP?

2. Magnesium once used in flashbulbs, burns according to the equation 2Mg(s) + O2(g)  2MgO(s) 1 | Page

a.

5.80 L of O2 at STP represents how many mol of O2?

b. 5.80 L of O2 at STP combines with what mass of Mg? (hint: look at part a)

3. Butane (C4H10) burns according to the following equation C4H10(g) + O2(g)  CO2(g) + H2O(l) a. What volume of CO2 measured at STP would be produced by 85.0 g of C4H10

b. What would be the volume of this same gas in part (a) at 1 atm and 50 °C?

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c. What volume of O2 measured at 3.25 atm and 127 °C would be required to react with 85.0 g of C4H10?

d. What volume of CO2 measured at STP would be produced from 45.0 L of C4H10 measured at 25 °C and 0.750 atm?

4. Given the following equation, solve the problem below: H3BCO(g) + H2O(l)  B(OH)3(aq) +

CO(g) +

H2(g)

A 425 mL quantity of H3BCO measured at 565 torr and 100 °C was allowed to react with excess H2O. What volume of gas was produced given that the measurement was taken at 25 °C and 0.900 atm?

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