Solve for the correct number of moles (Show Work Please)

Question

Equation: MgBr2 + Cl2 = MgCl2 + Br2

 

Given: .25 mol MgBr2 react

Answer 1

MgBr2 + Cl2 = MgCl2 + Br2

Always start with a correctly balanced equation, which this is.

 

moles 0.25 moles MgBr2 present

Question: how many moles of Cl2 are required for complete reaction?  How many moles of MgCl2 and Br2 are formed?

 

From the balanced equation, the mole ratio of Cl2 to BgBr2 is 1:1, so it will take 0.25 moles Cl2 for complete reaction

The mole ratio of MgCl2 to MgBr2 is also 1:1 so 0.25 moles MgBr2 can be formed

The mole ratio of Br2 to MgBr2 is also 1:1 and again 0.25 moles Br2 can be formed

 

This problem is all about having a balanced equation and recognizing MOLE RATIOS