Question

0.591 L of a 2.1 M KCl solution. Express your answer using two significant figures.

a) 0.59 mol
b) 1.2 mol
c) 1.3 mol
d) 2.1 mol

Answer 1

The number of moles of KCl in 0.591 L of a 2.1 M KCl solution is calculated as 1.2 moles, using the formula: Moles of KCl = Molarity × Volume.

Step-by-step explanation:

To determine the number of moles of KCl in 0.591 L of a 2.1 M KCl solution, you use the definition of molarity, which is moles of solute per liter of solution. The calculation is as follows:

Moles of KCl = Molarity (M) × Volume (L)

= 2.1 mol/L × 0.591 L

= 1.2411 moles

Expressing the answer with two significant figures, you get 1.2 moles of KCl.

The correct answer to the question is (b) 1.2 mol.