Question

Calculate the molarity of a solution prepared by dissolving 12.3 g of Na2CrO4 in enough water to produce a solution with a volume of 770. mL .

Answer 1

`\large \boxed{\text{0.0980 mol/L}}`

Step-by-step explanation:

The formula for molar concentration c is

`c =  \frac{\text{moles}}{\text{litres}}\\\\\text{Moles} = \text{12.3 g} * \frac{\text{1 mol}}{\text{162.97 g}} = \text{0.0755 mol }\\\\\text{Litres} = \text{770. mL} * \frac{\text{1 L}}{\text{1000 mL}} = \text{0.770 L }\\\\c = \frac{\text{0.0755 mol}}{\text{0.770 L}} = \text{0.0980 mol/L }\\\\`