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Sally L.

asked • 01/15/19

Need help with 2 AP chem questions.

Q1: A piece of magnesium was added to excess HCL at 725 mm Hg and 28.0°C. If 38.0 mL of hydrogen was collected over 20.0°C water, what is the mass of the magnesium?

Q2: In the reaction Mg(s) + 2HCL(aq)--> MgCl2(aq) + H2(g), a student obtained a sample of magnesium and reacted it with excess HCL. 29.9 mL of H2 was collected under the following conditions: Room temp= 20.0°C, pressure= 775 mm Hg, How many grams of Mg were consumed?

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