Question

How many grams of sucrose, molecular mass 342.34 g/mol, are dissolved in water to make 500. ml of a 0.462 m solution?

Answer 1

molarity = mol/L
500 mL = 0.5 L

342.34 g/mol * 0.462 mol/L = 158.16 g/L
158.16 g/L * 0.5 L = 79.1 g of sucrose is needed to create a 0.462 M solution.

Answer 2

79.1 g of sucrose, molecular mass 342.34 g/mol, are dissolved in water to make 500. ml of a 0.462 m solution.

Define molarity of a solution.

Molarity (M) is the amount of a substance in a certain volume of solution.

Molarity is defined as the moles of a solute per litres of a solution.

Molarity is also known as the molar concentration of a solution.

$Molarity= \frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}$

$0.462 = \frac{Moles \;solute}{0.5 ml}$

Moles = 0.231

$Moles = \frac{mass}{molar \;mass}$

Mass =  0.231 X 342.34

=79.1 g

Hence, 79.1 g of sucrose is needed to create a 0.462 M solution.

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