Question

The number of moles of solute present in 2.0 litre of 0.5 M NaOH solution is:

• A. $2$
• B. $1$
• C. $3$
• D. $4$

Answer 1

Answer: (B)

$1$

$Molarity=\frac{\text{No. of moles.}}{\text{Volume (litre})}$

$0\cdot 5=\frac{\text{No. of moles}}{2}$

No. of moles $=0\cdot 5\times 2$

$=1$