Question

type the correct answer in the box. isopropanol (c₃h₈o) is a key ingredient in some hand sanitizers. suppose that 127 grams of isopropanol is dissolved in water. the volume of the solution is 1,250 milliliters. what is the molarity of the solution? refer to the periodic table to help you answer. express your answer to three significant figures. the molarity of the solution is m.

Explanation:

Step1: Calculate molar mass of isopropanol

$M_{C_3H_8O}=3\times12.01 + 8\times1.008+16.00=60.094\ g/mol$

Step2: Calculate moles of isopropanol

$n=\frac{m}{M}=\frac{127\ g}{60.094\ g/mol}\approx2.11\ mol$

Step3: Convert volume to liters

$V = 1250\ mL=1.25\ L$

Step4: Calculate molarity

$M=\frac{n}{V}=\frac{2.11\ mol}{1.25\ L}=1.688\ M\approx1.74\ M$

Answer:

$1.74$