Question

How many grams of $NaOH$ are present in $250\, mL$ of $0.5 \,M\, NaOH$ solution?

• A. $7.32 \,g$
• B. $3.8 \,g$
• C. $5 \,g$
• D. $0.5 \,g$

Answer 1

Answer: (C)

$5 \,g$

Answer 2

No. of moles of $NaOH$ $= \frac{M \times V}{1000} = \frac{0.5 \times 250}{1000} = 0.125$ Mass of $NaOH = 40 \times 0.125 = 5 \,g$