Answered: The number of H atoms in 10.0 moles of…

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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Question

The number of H atoms in 10.0 moles of NH 3 (subscript)

Expert Solution

Step 1

The number of atoms or particles present in 1 mol of substance is given by Avogadro constant. The number of atoms present per mole of substance is 6.022×10²³ atoms/mol.

Step 2

The number of moles of NH₃ is 10.0 mol. Each molecule of NH₃ contains three hydrogen (H) atoms. The number of H-atoms present in NH₃ is calculated as,

$N_{H} = 3 H - atoms \times n_{{NH}_{3}} \times N_{A}$

Where,

$n_{{NH}_{3}}$ is the number of moles of NH₃.
N_A is the Avogadro constant.

Substitute the value of number of moles and Avogadro constant in the above formula.

$\begin{array}{rcl} N_{H} & = & 3 H - atoms \times 10 mol \times 6.022 \times 10^{23} atoms / mol \\ = & 1.8066 \times 10^{25} H - atoms \end{array}$

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