Question

Which of the following represents the formula of a substance which contains 50% oxygen?
(A)N2O
(B) CO2
(C) NO2
(D) CH3OH
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Answer 1

here your answer

(d).....

.

Answer 2

The Answer is (D) CH3OH.

Molecular mass of methanol = 1x12.01+4x1.008+ 1x16.0

= 32.042 gm

Percent composition of carbon = 

Mass of carbon x 100

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Molecular mass of CH3OH

= 12.01 / 32.042 X 100 = 37.48%

Percent composition of Hydrogen = Mass of Hydrogen x 100

Molecular mass of CH3OH

= 4.032 x 100 / 32.042 = 12.5%

Percent composition of Oxygen = 16x100 / 32.04 = 49.93%