Chemistry home work

Question

What is the mass in grams of magnesium chloride that can be produced from 6.93 miles of chlorine gas reacting with excess magnesium ?

Answer 1

First, write the correctly balanced equation for the reaction taking place:

Cl₂(g) + Mg(s) ==> MgCl₂(s) ... balanced equation

6.93 mol..xs............? moles

1 mole Cl₂ produces 1 mole MgCl₂

6.93 moles Cl₂ produces 6.92 moles MgCl₂

To find the mass of MgCl₂, use the molar mass of MgCl₂ (95.2 g/mol) as follows:

6.93 mol MgCl₂ x 95.2 g MgCl₂/mol MgCl₂ = 660 g MgCl₂ can be produced