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Which of the following has highest percentage of oxygen by mass? (1) h20 (2) co2 (3)caco3 (4) c2h5oh

Which of the following has highest percentage of oxygen by mass? (1) h20 (2) co2 (3)caco3 (4) c2h5oh

Grade:12th pass

2 Answers

Pawan Prajapati
askIITians Faculty 8741 Points
8 months ago
Answer:

caco3 has the highest percentage of oxygen by mass

Thanks
Krisha
13 Points
2 months ago
CaCO3 has molecular weight 100g.
100g of CaCO3 contain (16*3) 80g of oxygen.
% by mass of oxygen= 80/100*100 =80% 
In H2O, % by mass of oxygen=16/18*100
=88% 
In CO2 ,% by mass of oxygen=32/44*100
=72%
In C2H5OH, % by mass of oxygen=16/46*100 =34%
H2O has higher % of oxygen by mass.
 

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