Question

Calculate milli-moles and moles of a solute in 2000 mL solution which is 1 M.

• A. 2, 0.2
• B. 2, 2000
• C. 2000, 2
• D. $2\times {10}^3,2\times {10}^{-3}$

Answer 1

The correct option is C

2000, 2

We know that,
Molarity = $\frac{\text{Number of moles of solute}}{\text{Number of litres of solution}}$
$\Rightarrow$ Number of moles = Molarity $\times$ [Number of litres of solution]
= 1 $\times$ [2000 $\times$ ${10}^{-3}$]
= 2 moles

$\therefore$ Number of mill - moles = 2 $\times$ ${10}^3$ = 2000