1. When a certain acid and a certain base are mixed together, a reaction occurs that produces a gas as one of the products. The gas has a density of 2.62 g/L at 1.47 atm and 27°C. What are the molar mass and identity of the gas? H2, 2 g/mol b. CO, 28 g/mol O2, 32 g/mol d. CO2, 44 g/mol SO2, 64 g/mol а. е. с.

Magnesium reacts with hydrochloric acid in the single displacement reaction shown: Mg (s) + 2 HCl (aq) = MgCl2 (aq) + H2 (g) If 420 mL of 5.0 M HCl react with excess magnesium… a.) How many moles of HCl are consumed? b.) How many grams of MgCl2 will form? c.) At a pressure of 1.0 atm and a temperature of 30 °C, what volume of H2 will form?

5. Acetylene gas reacts with oxygen and burns at high temperature in an acetylene torch. a. Write the balanced equation for the complete combustion of acetylene. b. How many grams of O2 are needed to react with 8.5 L acetylene at STP? (hint 1 mol O2 (STP)=22.4 L of O2)

Automobile airbags are inflated by the rapid decomposition of sodium azide (NaN3). 2 NaN3(s) --> 2 Na(s) + 3 N2(g) What volume of N2 gas, at 0.973 atm and 21.3 oC, is produced by the complete decomposition of 119 g of sodium azide? V = ___ L

A flask contains 0.023 M H₂ gas at a pressure of 180 mmHg. Nitrogen gas (N₂) is added to bring the total pressure of the flask to 1.00 atm at constant temperature. a. What is the temperature of the H₂ gas in the flask? b. What is the concentration of N₂ gas in the flask? c. What are the mole fractions of the N₂ and H2 gases in t flask? d. The mixture of N2 and H2 gas reacts to produce ammonia, NH3, according to the equation below. How many moles of NH3 can be formed from the H2 and N2 in the flask? N2 (g) + 3H2(g) → 2NH3(g) e. Which of the gases in the container would have the highest average kinetic energy? f. Which of the gases in the container would have the greatest average speed?

8. In one lab this semester, you ran the reaction: KC1O3 (s) → KCl (s) + O2 (g). The directions asked you to add about 1.5 g KC1O3 to a crucible. How many liters of O2 should form at STP?