Question

calculate the molarity for 32 grams of NaCl dissolved in 250 mL H20

Answer 1

Answer on the question #42926, Chemistry, Other

Question:

calculate the molarity for 32 grams of NaCl dissolved in 250 mL H2O

Solution:

The molar concentration $c_{i}$ is defined as the amount of substance of the constituent $n_{i}$ divided by the volume of the mixture:

$$c_{i} = \frac{n_{i}}{V}$$ $$n(\mathrm{NaCl}) = \frac{m(\mathrm{NaCl})}{M(\mathrm{NaCl})} = \frac{32}{58,443} = 0.5475 \text{ mol}$$ $$c_{i} = \frac{0.5475}{0.25} = 2.19 \text{ mol L}^{-1}$$

Answer: 2.19 mol L$^{-1}$

http://www.AssignmentExpert.com/