Question

How many grams of `NaCl` in 50 mL of 0.75 M `NaCl` solution?

Answer 1

`2.19 grams NaCl`

Explanation:

The MOLARITY of a solution is determined by the ratio of moles of solute, (the material being dissolved), compared to the liters of solution. the equation is `M = (mol)/L`

For this `NaCl` solution we have a Molarity of 0.75 in 50 mL of solution.

Therefore

M = 0.75 M
V = 50 mL or 0.050 L
moles = `x`

`0.75M = (x mol)/(0.050 L)`

`0.050 L (0.75 M) = x mol`

`0.0375 mol = x`

Use the molar mass of `NaCl` to convert the moles to grams.

`0.0375 cancel(mol NaCl) x (58.44 g NaCl)/(1 cancel(mol NaCl)) = 2.19 grams NaCl`