Answer
(a) 0.149 M
(b) 0.461 M
(c) 0.0300 M
Work Step by Step
Recall: Molarity= $\frac{\text{moles solute}}{\text{litres solution}}$
(a) Molarity= $\frac{\frac{22.6\,g}{342.3\,g/mol}}{0.442\,L}=0.149\,M$
(b) Molarity= $\frac{\frac{42.6\,g}{58.44\,g/mol}}{1.58\,L}=0.461\,M$
(c) Molarity= $\frac{\frac{315\times10^{-3}\,g}{180.156\,g/mol}}{58.2\times10^{-3}\,L}=0.0300\,M$
