MCQ practice · SSC Chemistry Board questions · Chapter 6: Concept of Mole and Chemical Counting
If enough vinegar is added to the reaction vessel, what is the molecular mass of the salt formed?
Think it through first, then pick an option.
- a 60
- b 68
- c 82
- d 141
Answer and explanation
Correct answer: c 82
The salt is CH₃COONa: 2 × 12 + 3 × 1 + 2 × 16 + 23 = 82.
Why the other options are wrong
- a 60: 60 is the molecular mass of CH₃COOH (the vinegar acid), not of the salt.
- b 68: 68 is the mass of HCOONa (sodium formate); vinegar is CH₃COOH, so the salt is CH₃COONa.
- d 141: 141 is not the right sum; CH₃COONa = 24 + 3 + 32 + 23 = 82.
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