MCQ practice · SSC Chemistry Board questions · Chapter 6: Concept of Mole and Chemical Counting
How many grams are two moles of X?
Think it through first, then pick an option.
- a 78 g
- b 84 g
- c 156 g
- d 168 g
Answer and explanation
Correct answer: d 168 g
X = C₆H₁₂ = 72 + 12 = 84; 2 moles = 2 × 84 = 168 g.
Why the other options are wrong
- a 78 g: 78 g is 1 mole of C₆H₆; X (C₆H₁₂) is 84 per mole.
- b 84 g: 84 g is 1 mole of X; the question asks for two moles.
- c 156 g: 156 g is 2 moles of C₆H₆; X has no double bond, it is C₆H₁₂.
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