calculate the molarity of each of the following solutions. use the periodic table if necessary. a salt…

calculate the molarity of each of the following solutions. use the periodic table if necessary. a salt solution with a volume of 250 ml that contains 0.70 mol nacl. a salt solution that contains 0.90 g of nacl in 100.0 ml of solution.

calculate the molarity of each of the following solutions. use the periodic table if necessary. a salt solution with a volume of 250 ml that contains 0.70 mol nacl. a salt solution that contains 0.90 g of nacl in 100.0 ml of solution.

Answer

Explanation:

Step1: Calculate molar mass of NaCl

The molar mass of Na is 22.99 g/mol and Cl is 35.45 g/mol. So, molar mass of NaCl, $M = 22.99+35.45=58.44$ g/mol.

Step2: Calculate moles of NaCl

Given mass of NaCl is $m = 0.90$ g. Using the formula $n=\frac{m}{M}$, we have $n=\frac{0.90}{58.44}\approx0.0154$ mol.

Step3: Convert volume to liters

The volume of the solution $V = 100.0$ mL. Since 1 L = 1000 mL, $V=100.0\div1000 = 0.100$ L.

Step4: Calculate molarity

The formula for molarity $M=\frac{n}{V}$. Substituting $n = 0.0154$ mol and $V=0.100$ L, we get $M=\frac{0.0154}{0.100}=0.154$ M.

Answer:

0.154 M