In the reaction mg(s) + 2hcl(aq) → h2(g) + mgcl2(aq), how many moles of hydrogen gas will be produced from 250.0 milliliters of a 3.0 m hcl in an excess of mg? 0.75 moles 0.38 moles 3.0 moles 1.5 moles

0.38 moles of hydrogen gas will be produced.

Explanation:

Mole sof HCl = n

Molarity of the HCL solution = 3.0 M

Volume of HCL solution = 250.0 mL = 0.250 L

n = 0.75 mol

According to reaction , 2 moles of HCl gives 1 mol of hydrogen gas.

Then 0.75 mol of HCL will give:

of hydrogen gas.

0.38 moles of hydrogen gas will be produced from 250.0 milliliters of a 3.0 M HCl in an excess of Mg.

if you're asking what comes out, it's steam.