Magnesium metal (0.100 mol) and hydrochloric acid (0.500 mol hcl) are combined and react to completion. what volume of hydrogen gas, measured at stp, is produced? mg(s) + 2hcl(aq) → mgcl2(aq) + h2(g) (r = 0.08206 l • atm/k • mol) select one: a. 22.4 l of h2 b. 5.60 l of h2 c. 4.48 l of h2 d. 11.2 l of h2 e. 2.24 l of h2

A. of

Explanation:

1. First take the balanced chemical equation to obtain hydrogen gas:

2. Find the limiting reagent to how much hydrogen is formed:

Take the number of moles of each compound and divide it between the stoichiometric coefficient in the balanced chemical equation.

- For the Mg:

- For the HCl:

The magnesium is the limiting reagent.

3. Find the number of moles of hydrogen produced:

4. Find the volume of hydrogen using the ideal gas equation at STP:

The ideal gas equation is expressed as , where P is the pressure, at STP P=1 atm, V is the volume, n is the number of moles, R is a constante whose value is R=0.08206, and T is the temperature, at STP T=273K

Solving for V:

Replacing values:

of