# DBT JRF 2022 — Question 2

Exam: DBT JRF 2022 · Section: B · Topic: Biochemistry › Molarity & Solution Calculations · Difficulty: Medium

## Question

What is the molarity of 100 g Glycine (75 Daltons) dissolved in 1 liter water?

## Options

- **A.** 75.0 M
- **B.** 0.0133 M
- **C.** 1.33 M
- **D.** 10.0 M

## Answer

Option C

## Explanation

Molarity of glycine solution: Given: 100 g glycine dissolved in 1 litre of water; MW of glycine = 75 Da (g/mol). $\text{Molarity} = \frac{\text{mass (g)}}{\text{MW (g/mol)} \times \text{Volume (L)}} = \frac{100}{75 \times 1} = 1.33\,\text{M}$ Note: The question says 75 Daltons (which equals 75 g/mol). Glycine's actual MW is 75.07 g/mol — consistent. Answer: 1.33 M (Option 3).

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