Mole concept questions with solutions

 

1. How many moles are there in 8.8 grams of CO2 gas? (C: 12, O: 16)

 Solution:

1 mole of CO2            44g
x moles of CO2           8,8g

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x= 8,8 /44 = 0.2 mol of CO2

 

2. How many grams are there in 4 moles of N2 gas?

Solution:

1 mole of N2          28g
4 moles of N2          x grams

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x= 112 grams of N2.

 

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