Answered: Chemistry Question

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Step 1 Introduction

Molar Mass is defined as the mass of the one mole of the molecule. One mole of any substance contains the avagadro number of molecules. The Avagadro number is 6.023 $\times 10^{23}$ .

Molar Mass of Phosphorus trichloride(PCl₃)=137.33 g/mol

Step 2 Solution to Question 1

$\begin{array}{rcl} 1 m o l e o f P C l_{3} w e i g h s & = & 137.33 g \\ \begin{array}{rc} 5.62 g o f P C l_{3} & c o n t a i n s \end{array} & = & \frac{5.62}{137.33} m o l \\ = & 0.0409 m o l \\ 1 m o l o f P C l_{3} c o n t a i n s & = & 6.023 \times 10^{23} m o l e c u l e s o f P C l_{3} \\ 0.0409 m o l o f P C l_{3} c o n t a i n s & = & 0.0409 \times 6.023 \times 10^{23} \\ = & 0.2463 \times 10^{23} m o l e c u l e s o f P C l_{3} \\ = & 2.463 \times 10^{22} m o l e c u l e s o f P C l_{3} \end{array}$