How to find the weight of element in a given weight of compund?

For eg. Find the weight of Carbon in 99 g of C02

Dear student,

44 gm CO2 has weight 12 gm carbon.

Then weight of 99gm CO2=(12/44)*99

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Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

99gm CO₂ = 99/44 mol of CO₂                    (molar mass of CO₂ = 44)

1 mol CO₂  gives 1mol carbon + 2 mol oxygen

99/44 mol CO₂ gives 99/44 mol carbon + 2(99/44) mol oxygen

 99/44 mol carbon = 12(99/44) gram

                          =27 gram C

i mole of co2 =44g ,it contains 12 g of carbon

so 99g of co2 will contain (99*12)/44 =27 g ...