February 25, 2026

Mole Concept and stoichiometry-MCQ

All About Chemistry01 mins
Mole Concept and stoichiometry

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#1. Calculate the % of carbon in C2H4O5. [C=12, H=1, O=16]

#2. The % of C in C2H5N. [C=12,H=1, N=14]

#3. A binary compound contains 12.5% hydrogen and the rest nitrogen.[H=1, N=14] If the molar mass of the compound is 32. Calculate its molecular formula.

#4. Anhydrous dibasic acid has 2.25% hydrogen, 26.7% carbon and 71.15% oxygen.[C=12,H=1,O=16] Calculate its molecular formula if the vapour density of the compound is 45.

#5. An organic compound contains 23.76% Carbon, 5.94% Hydrogen and 70.30% Chlorine.[C=12,H=1,Cl=35.5] If its molecular mass is 50.5. Calculate its molecular formula.

#6. An organic compound contains 14.4% carbon, 1.2% hydrogen and 84.5% chlorine.[C=12, H=1, Cl=35.5] If the molar mass of the compound is 168. Calculate its molecular formula.

#7. An organic compound contains 12.67% carbon, 2.13% hydrogen and 85.11% of Br.[C=12,H=1,Br=80]. If the vapour density of the compound is 94. Calculate its molecular formula.

#8. A compound contains 40% Carbon, 6.7% Hydrogen and 53.3% Oxygen.[C=12,H=1,O=16] If the vapour density of the compound is 90. Calculate its molecular formula.

#9. A compound contains 4.8% carbon, 95.2% bromine.[C=12, Br=80] If its vapour density is 252. Calculate its molecular formula.

#10. A hydrocarbon contains 80% Carbon, 20% Hydrogen. [C=12, H=1]. If the vapour density of the compound is 15. Calculate its molecular formula.

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