Question

A student needs 6.4 liters of a 0.64 molar solution for an experiment. How many grams of solute does the student need if the molar mass of the solute is 11.83 g/mol? Round your answer to the nearest 0.01, and remember to include units (properly abbreviated), BUT NOT THE SUBSTANCE

Answer 1

Multiplying the liters of solution by the concentration we obtain the moles of solute:

$n=6.4L\cdot0.64M=4.096\text{moles of solute}$

Now, multiply these moles by the molar mass:

$4.096\text{moles}\cdot\frac{11.83g}{\text{mol}}=48.46g$

There are 48.46g needed.