Chemistry 2023 Jamb Examination
Chemistry 2023 Jamb Examination
Question 81
What is the mass percentage of carbon (C) in methane (CH₄)? (The molar mass of carbon is approximately 12 g/mol.)
The molar mass of methane (CH₄) is \( 12 + (4 \times 1) = 16 \; \text{g/mol} \).
The mass contribution of carbon is 12 g/mol.
Thus, the percentage of carbon is \( \dfrac{12}{16} \times 100 = 75\% \).
Therefore, methane contains 75% carbon by mass.
The mass contribution of carbon is 12 g/mol.
Thus, the percentage of carbon is \( \dfrac{12}{16} \times 100 = 75\% \).
Therefore, methane contains 75% carbon by mass.
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Question 82
Which of the following is a common property of non-metals?
Non-metals generally have high electronegativity and tend to gain electrons during chemical reactions to form anions.
They are poor conductors of heat and electricity and can exist as solids, liquids, or gases at room temperature depending on the element.
This electron-gaining tendency distinguishes them from metals, which typically lose electrons to form cations.
They are poor conductors of heat and electricity and can exist as solids, liquids, or gases at room temperature depending on the element.
This electron-gaining tendency distinguishes them from metals, which typically lose electrons to form cations.
Not clear enough?
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