# How many platinum atoms are in a pure platinum ring weighing 4.32 g?

### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

Chapter
Section

### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 3, Problem 52E
Textbook Problem
278 views

## How many platinum atoms are in a pure platinum ring weighing 4.32 g?

Interpretation Introduction

Interpretation:

The number of platinum atoms in a pure platinum ring with given mass, is to be calculated.

Concept Introduction:

 A mole is a unit of amount of substance. It relates a number of particles to the molar mass.

 One mole of a substance contains Avogadro’s number, that is, 6.022×1023 particles. The number remains constant regardless of the nature of the substance. One mole of an atom contains 6.022×1023 atoms. One mole of molecules contains 6.022×1023 molecules.

 It also relates to the molar mass of a substance in grams. One mole of a substance weighs that amount in grams, which is equal to its molar mass.

### Explanation of Solution

Given information: The mass of the pure platinum ring is 4.32 g.

The number of atoms in Pt is calculated as follows:

The molar mass of Pt is 195.1 g.

6.022 ×1023 atoms of Pt = 1 mole of Pt = 195.1 g195.1 g of Pt contains = 6.022 ×1023 atoms of Pt

Therefore,

4.32 g of Pt contains =   4.32g×1 mol Pt195

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