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
- 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
- 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
- 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 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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