Question

How many moles of NH3 are in 0.250 L of a 5.00 M aqueous solution?

Answer 1

Data Given:
Molarity = 5.0 mol/L

Volume = 0.250 L

Solution:
As we know a concentration unit, Molarity is the number of moles dissolved per unit volume of solution...

Molarity = Moles / Volume of Solution

As, we are in need of moles, so solve above equation for moles, i.e.

Moles = Molarity × Volume

Putting Values,

Moles = 5 mol.L⁻¹ × 0.250 L

Moles = 1.25 Moles