Question on: JAMB Chemistry - 2023
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What is the mass percentage of carbon (C) in methane (CH4)? (The molar mass of carbon is approximately 12 g/mol.)
A
25%
B
12%
C
75%
D
50%
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Correct Option: C
To calculate the mass percentage of carbon in methane (CHâ‚„), you need to consider the molar mass of carbon and methane.
The molar mass of CHâ‚„:
Carbon (C) has a molar mass of approximately 12 g/mol.
Hydrogen (H) has a molar mass of approximately 1 g/mol.
Therefore, the molar mass of CHâ‚„ = 12 g/mol (C) + 4 g/mol (H) = 16 g/mol.
The mass percentage of carbon in CHâ‚„ is calculated as follows:
(12 g/mol / 16 g/mol) × 100% = 75%
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