Percentage Composition, Empirical and Molecular Formulae NEET Questions

Physical Chemistry - Some Basic Concepts of Chemistry

Percentage Composition, Empirical and Molecular Formulae MCQ Questions


1.
The percentage composition of an element in a compound is calculated using the formula:
A.
(Atomic mass × 100) / Molar mass of compound
B.
(Mass of element / Atomic mass of element) × 100
C.
(Molar mass of compound / Mass of element) × 100
D.
(Mass of element in compound × 100) / Molar mass of compound
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ANSWER :
D. (Mass of element in compound × 100) / Molar mass of compound
2.
The mass percent of hydrogen in water (H₂O) is approximately:
A.
88.9%
B.
16.7%
C.
5.5%
D.
11.1%
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ANSWER :
D. 11.1%
3.
The mass percent of oxygen in CO₂ is:
A.
72.73%
B.
27.27%
C.
88.89%
D.
50.00%
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ANSWER :
A. 72.73%
4.
Calculate the mass percent of nitrogen in NH₃: (N=14, H=1)
A.
94.0%
B.
14.0%
C.
82.4%
D.
70.6%
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ANSWER :
C. 82.4%
5.
The mass percent of carbon in glucose (C₆H₁₂O₆) is approximately:
A.
40%
B.
30%
C.
53%
D.
20%
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ANSWER :
A. 40%
6.
In sodium sulphate (Na₂SO₄), the mass percent of sodium is: (Na=23, S=32, O=16)
A.
16.2%
B.
23.0%
C.
32.4%
D.
45.1%
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ANSWER :
C. 32.4%