   Chapter 15, Problem 41QAP ### Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

#### Solutions

Chapter
Section ### Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
12 views

# 41. If 42.5 g of NaOH is dissolved in water and diluted to a final volume of 225 mL, calculate the molanty of the solution.

Interpretation Introduction

Interpretation:

The molarity of NaOH in the solution is to be calculated.

Concept Introduction:

The atomic mass of an element is defined as the sum of number of protons and number of neutrons. Molar mass of an elementis determined from atomic mass of an element.

The number of moles is calculated by the formula,

Moles=MassgMolarmass

Molarity is used to find out the concentration of solution.

The molarity is calculated by the formula,

Molarity=NumberofmolesofsoluteLitersofsolution.

Explanation

It is given that 42.5g of NaOH is added to total volume of 225mL.

The molar mass of NaOH is,

Molarmass=AtomicmassofNa+AtomicmassofH+AtomicmassofO=23+1+16g/mol=40g/mol

The number of moles is calculated by the formula,

Moles=MassofNaOHgMolarmassofNaOH

Substitute the values of mass and molar mass of NaOH in the above expression.

Moles=42

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