Chemistry
Chemistry
13th Edition
ISBN: 9781259911156
Author: Raymond Chang Dr., Jason Overby Professor
Publisher: McGraw-Hill Education
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Chapter 1, Problem 1.77QP

The unit “troy ounce” is often used for precious metals such as gold (Au) and platinum (Pt). (1 troy ounce = 31.103 g.) (a) A gold coin weighs 2.41 troy ounces. Calculate its mass in grams. (b) Is a troy ounce heavier or lighter than an ounce? (11b = 16 oz; 11b = 453.6 g.)

(a)

Expert Solution
Check Mark
Interpretation Introduction

Interpretation:

From the given data’s, it should be calculated the mass of gold coinin grams and it should be checked whether a troy ounce is heavier or lighter than an ounce.

Concept Introduction:

Conversion formula;

1troyoz(troy ounce)Au=31.103gAu1 pound(Ib)=453.6g1pound(Ib)=16ounce(oz)

Explanation of Solution

To determine: The mass of gold coin in grams

The unit of troy ounce is used for metal such as gold and platinum.  A gold coins weights 2.41 troy ounce.  Mass of gold coin in grams can be calculated by using conversion formula.

That is,

1troyoz(troy ounce)Au=31.103gAu

So,

2.41troyozAu×31.103gAu1troyozAu=75.0gAu

(b)

Expert Solution
Check Mark
Interpretation Introduction

Interpretation:

From the given data’s, it should be calculated the mass of gold coinin grams and it should be checked whether a troy ounce is heavier or lighter than an ounce.

Concept Introduction:

Conversion formula;

1troyoz(troy ounce)Au=31.103gAu1 pound(Ib)=453.6g1pound(Ib)=16ounce(oz)

Explanation of Solution

To check: Whether a troy ounce is heavier or lighter than an ounce.

By using conversion factor, it can be check whether a troy ounce is heavier or lighter than an ounce.

That is, 1 troy oz should be converted to gram and the 1 gram should be converted to pound .at last 1 pound should be converted to ounce.

1 troy ozgIboz

1troyoz(troy ounce)Au=31.103gAu1 pound(Ib)=453.6g1pound(Ib)=16ounce(oz)

So the conversion can be done as follows;

1troyozAu×31.103gAu1troyozAu×1Ib453.6g×16ounce1Ib=1.097ozThatis,1troyoz=1.097oz

So, it can be concluded that A troy ounce is heavier than an ounce

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