Question

what is the molarity of 820 ml of Kl solution that contains 36.52 g of Kl? plz help me

Answer 1

The formula is molarity (M) = moles / liters

molarity (M) = ?

1/ mass = 36.52 g of KCl (you need to find the mole)

mole = mass / Molar mass

Molar mass of KCl:

K = 39.10 g/mol

Cl = 35.45 g/mol

Add K and Cl together: 39.10 + 35.45 = 74.55 g/mol

mole = 36.52 g of KCl / 74.55 g/mol

mole = 0.489 mol of KCl

2/ Volume = 820 mL ( you need to convert to the l)

820 / 1000 = 0.82 L

= M = mol / L

    M = 0.489 mol / 0.82 L

    M = 0.59 mol/L