Question

What is the molarity of 0.50 g of Na dissolved in a 1.5 L solution? M

Answer 1

Molar mass Na = 23.0 g/mol

M = m / molar mass * V

M = 0.50 / 23.0 * 1.5

M = 0.50 / 34.5

 = 0.01449 M

hope this helps!

Answer 2

Answer:

0.015M

Explanation:

The formula for Molarity (M) is

M = n÷V (in litres)

where M = Molarity

           n = number of moles (unknown)

           V = volume of solvent in litres/dm3 (1.5L)

Unit for Molarity can be M, mol/dm3, mol/L

n = m÷mm

where m = mass of substance, Na (0.50g)

          mm = molar mass of substance, Na (23 g/mol)

n = 0.5 ÷ 23

n = 0.022 moles

M = 0.022 ÷ 1.5 = 0.015 M