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Chemistry-Atomic & Molecular Mass

NEET Chemistry Atomic & Molecular Mass MCQ Question

Type: MCQ-conceptual-Medium-Class 11

Which combination of statements about atomic and molecular mass is correct?

A
  1. The molar mass of sodium acetate is 82.0245 g/mol. 2. 1 mole of carbon can produce a fixed amount of CO2 when burned. 3. Molarity is the number of moles of solute per liter of solution.
B
  1. The molar mass of sodium acetate is 100 g/mol. 2. 1 mole of carbon produces 2 moles of CO2 when burned. 3. Molarity is only relevant in solid solutions.
C
  1. Molar mass is irrelevant in chemical reactions. 2. 1 mole of carbon produces 1 mole of CO2 when burned in air. 3. Molarity is defined as grams of solute per liter of solution.
D
  1. 1 mole of any substance always weighs the same. 2. The mass of sodium acetate is not needed for molarity calculations. 3. Molarity only applies to gases.

Correct Answer

Option A

Detailed Explanation

Statement 1 is correct as per the given molar mass of sodium acetate. Statement 2 is true because combustion of 1 mole of carbon produces a fixed amount of CO2. Statement 3 correctly defines molarity.

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