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

true

explanation:

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.