Question

What is the molarity of a solution that contains 0.400 mol HCl in 9.79 l solution?

Answer 1

Answer:

• Option B, 0.0409 M

Explanation:

1) Data:

a) M = ?

b) n = 0.400 mol

V = 9.79 liters

2) Formula:

• M = n / V (in liters)

3) Solution:

• M = 0.400 mol / 9.79 liter = 0.04086 M

• Since each data contain 3 significant digits, the answer must be reported with 3 significant digits. So, the correct answer is 0.0409 M, which is the option B.