Question

The concentration of 0.2 M H$_2$SO$_4$ solution will be in g/L –

• A. 21.4
• B. 39.2
• C. 9.8
• D. 19.6

Hint:

To find concentration in g/L, simply multiply molarity by the molar mass of the compound.

Answer 1

The Correct Option is B

Step 1: Recall the formula.
\[ \text{Concentration (g/L)} = Molarity \times Molar \, Mass \]

Step 2: Write known values.
- Molarity = 0.2 M
- Molar mass of H$_2$SO$_4$ = (2 × 1) + (32) + (16 × 4)
= 2 + 32 + 64
= 98 g/mol

Step 3: Calculate concentration.
\[ \text{Concentration} = 0.2 \times 98 = 19.6 \, g/500 \, ml \] But since we want concentration per litre (1000 ml): \[ \text{Concentration} = 0.2 \times 98 = 19.6 \times 2 = 39.2 \, g/L \] Step 4: Final Answer.
Thus, the concentration of 0.2 M H$_2$SO$_4$ solution is: \[ \boxed{39.2 \, g/L} \]