Problem: How many moles of H2 can be produced from y grams of Al in magnesium-aluminum alloy? The molar mass of Al is 26.98 g/mol.Express your answer in terms of y to four decimal places (i.e., 0.5000y).A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl(aq). When the liberated H2(g) is collected over water at 29 °C and 752 torr, the volume is found to be 319 mL. The vapor pressure of water at 29 °C is 30.0 torr.

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How many moles of H2 can be produced from y grams of Al in magnesium-aluminum alloy? The molar mass of Al is 26.98 g/mol.

Express your answer in terms of y to four decimal places (i.e., 0.5000y).


A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl(aq). When the liberated H2(g) is collected over water at 29 °C and 752 torr, the volume is found to be 319 mL. The vapor pressure of water at 29 °C is 30.0 torr.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Gas Stoichiometry concept. If you need more Gas Stoichiometry practice, you can also practice Gas Stoichiometry practice problems.

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Based on our data, we think this problem is relevant for Professor Meador's class at American River College.