2. (6 pts) In a reaction, 235 mL of 1.50 M HCl solution reacts completely with an excess amount of aluminum. If the hydrogen gas is collected over water in a container with a volume of 3.60 L and at a
temperature of 25.0 °C, calculate the pressure in the container. The vapor pressure of water is 23.78
mmHg (Table 6.4, page 232).
2Al(s) + 6HCl(aq) + 3H2(g) + 2AlCl3(aq)

Explanation:

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In this case, since the total pressure in the container includes the pressures of both hydrogen and water:

For the reacting solution of HCl, based on the 6:3 mole ratio with hydrogen in the chemical reaction, we can next compute the yielded moles o hydrogen:

Then, by using the ideal gas equation we compute the pressure of hydrogen for the collected 3.60 L at 25.0 °C (298.15 K):

Finally, since the vapor pressure of water in at is 0.03129, the total pressure is then:

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