Question

The molarity of 720 g of pure water is

• A. 40 M
• B. 4 M
• C. 55.5 M
• D. Unpredictable

Answer 1

Answer: (C)

Molarity = $\frac{w_B(g)\times 1000}{M_B\times V_A(mL)}$
= $\frac{720\times 1000}{18\times 720}=55.5M$
[720 g of water = 720 mL of water] .