Question

What volume of 0.220 MM ethanol solution contains each of the following number of moles of ethanol?

a) 0.47 molmol ethanol

5) 1.20 molmol ethanol

c) 1.2×10−2 molmol ethanol

Answer 1

Molarity$(M)=\frac{N_{mol}}{V_{sol}}$

where $N_{mol}$ is number of moles of solute and $V_{sol}$ is volume of solution.

$\implies V_{sol}=\frac{N_{mol}}{M}$

Given,The solution has $M=0.220 \ mol/L$ .

$a)$ $0.47$ mol ethanol 

$N_{mol}=0.47$

$\implies V_{sol}=\frac{0.47}{0.220}=2.13\ L$

$b) \ 1.20$ mol ethanol

$N_{mol}=1.20$

$\implies V_{sol}=\frac{1.20}{0.220}=5.45\ L$

$c)\ 1.2\times 10^{-2}$ mol ethanol

$N_{mol}=1.2\times 10^{-2}$

$\implies V_{sol}=\frac{1.2\times10^{-2}}{0.220}=5.45\times 10^{-2}\ L=54.5\ ml$