Some Basic Concepts of Chemistry Part 2

Initially,
Mass of CNG(CH4)=100‌gm
∴ Moles of CH4=‌

100

16

=6.25 moles
Mass of O2=208‌gm
∴ Moles of O2=‌

208

32

=6.5 moles
From reaction you can see,
1 mole of CH4 react with 2 mole of O2
∴6.25 mole of CH4 react with 6.25×2=12.5 moles of O2
But here only 6.5 moles of O2 present
So, O2 will act as limiting reagent.
∴ Produced CO2 will depends on moles of O2.
From 2 moles of O21 mole of CO2
∴ From 6.5 moles of O2‌

6.5

2

moles of CO2 produced.
∴ Weight of CO2=‌

6.5

2

×44=143‌gm