Chapter U4, Problem 7STP

Interpretation Introduction

Interpretation:

The correct description of the comparison of one mole of copper, Cu, magnesium, Mg, and neon, Ne, needs to be identified.

Concept introduction:

The mass of an atom in a chemical species is known as the atomic mass. The SI unit of mass is kilogram.

Answer to Problem 7STP

The option (D) is correct.

Explanation of Solution

1 mole of any substance means:

Molar mass of substance in gram

It contains $\text{ 6}\text{.022}\times {\text{10}}^{\text{23}}$ particles.

These substances are elements. So, 1 mole of each element will have $\text{ 6}\text{.022}\times {\text{10}}^{\text{23}}$ atoms, but all contains different masses depending on their molar mass.

The atomic number of Copper is 29 and its atomic mass is 63.546 u. The atomic number of magnesium is 12 and its atomic mass is 24. The atomic number of neon is 10 and its mass number is 20. So, all contains different number of atoms on the atomic mass.

So, option (D) is correct.