Mg + HCl → MgCl2 + H2 How many liters of hydrogen gas are produced at 298 K and 0.940 atm if 4.00 moles of hydrochloric acid react with an excess of magnesium metal?

74.04 liters of hydrogen gas are produced.

Explanation:

According to reaction, 2 mol of HCl gas gives 1 mole of hydrogen gas, then 6 moles of HCl gas will give: moles of hydrogen gas that is 3 moles.

The pressure of the hydrogen gas at 298 K = 0.990 atm

The volume occupied by the hydrogen gas = V

Number of hydrogen has moles = 3 moles

PV=nRT

V = 74.04 L

74.04 liters of hydrogen gas are produced.

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