# What volume of hydrogen is formed by the interaction of 7 g of iron with hydrochloric acid?

First, write down the reaction equation.
Fe + 2HCl = FeCl2 + H2.

Determine the amount of iron substance, apply the following formula.
n = m / M.

Where n is the amount of substance.

m is the mass of the substance.

M is the molar mass of the substance.

M (Fe) = 56 g / mol.

n (Fe) = 7 g / 56 g / mol = 0.125 mol.

Next, use the reaction equation to determine the amount of hydrogen.
0.125 mol Fe – x mol H2.

1 mol Fe – 1 mol H2.

Determine the unknown value of x.

X = 0.125 mol * 1 mol: 1 = 0.125 mol.

Therefore, the amount of hydrogen substance is 0.125 mol.

Determine the volume of hydrogen.
V = n * Vm.

Vm is the molar volume, constant 22.4 L / mol.

V = 0.125 mol * 22.4 L / mol = 2.8 L.

Therefore, the volume of hydrogen is 2.8 liters.

Answer: V (H2) = 2.8 liters.

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