Question

What is the molarity of NaOH solution if 30.0g of NaOH solid was dissolved in 500.ml of water? (molar mass of NaOH is 40.0 g/mol)

Answer 1

The answer to your question is: 1.5 M

Step-by-step explanation:

Data

MW NaOH = 40 g/mol

mass = 30 g

V = 500 ml

Molarity (M) = ?

number of moles = n

Formula

M = n/V(l)

Process

40 g ------------------- 1 mol

30 g --------------------- x

x = (30)(1)/40

x = 0.75 mol

Volume

1000 ml ----------------- 1 l

500 ml ---------------- x

x = (500)(1) / 1000

x = 0.5 l

Molarity = 0.75 / 0.5

= 1.5 M