PLS HELP! CHEMISTRY: 23 grams of magnesium reacts with 12 grams of hydrogen chloride to produce 30 grams of magnesium chloride and a gas. what is the mass of the gas?

Mass of gas = 0.33 g

Explanation:

Given data:

Mass of magnesium = 23 g

Mass of HCl = 12 g

Mass of MgCl₂ produced = 30 g

Mass of hydrogen gas produced = ?

Solution;

Chemical equation:

Mg + 2HCl    →  MgCl₂ + H₂

Number of moles of Mg:

Number  of moles = mass/molar mass

Number  of moles = 23 g/ 24 g/mol

Number of moles = 0.96 mol

Number of moles of HCl:

Number  of moles = mass/molar mass

Number  of moles = 12 g/ 36.5 g/mol

Number of moles = 0.33 mol

Now we will compare the moles of Hydrogen gas with both reactant.

                                Mg            :          H₂

                                  1              :          1

                                 0.96        :        0.96

                                HCl           :           H₂

                                   2            :            1

                               0.33           :        1/2×.33= 0.165 mol

The number of moles of hydrogen gas produced by HCl are less so it will limiting reactant and limit the yield of gas,.

Mass of H₂:

Mass = number of moles × molar mass

Mass =  0.165 mol × 2 g/mol

Mass = 0.33 g

A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons. Hope that helps!