Introduction To Chemistry 5th Edition
Introduction To Chemistry 5th Edition
5th Edition
ISBN: 9781260162097
Author: BAUER
Publisher: MCG
Question
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Chapter 4, Problem 89QP

(a)

Interpretation Introduction

Interpretation:

The percent composition of copper in Cu2S is to be determined.

(a)

Expert Solution
Check Mark

Explanation of Solution

The percent composition of any substance is calculated by dividing the mass of substance in a sample by total mass of the sample. This ratio is multiplied by 100 % .

To determine the percent composition let the sample size be 1 mole . Now, determine the mass of each element contained in 1 mole of the compound Cu2S as follows:

The mass of Cu from periodic table is 63.55 g/mole . For 2 mole , the mass is,

m=2 mole×63.55 g/mole=127.1 g

The mass of S from periodic table is 32.06 g/mole . For 1 mole , the mass is,

m=1 mole×32.06 g/mole=32.06 g

Therefore, the total mass for 1 mole of Cu2S is,

total mass=127.1 g+32.06 g=159.2 g

Now, the percent composition of Cu is,

% Cu=127.1 g159.2 g×100 %=79.84 %

(b)

Interpretation Introduction

Interpretation:

The percent copper in Cu2CO3OH2 is to analyzed.

(b)

Expert Solution
Check Mark

Explanation of Solution

To determine the percent composition, let the sample size be 1 mole . Now, determine the mass of each element contained in 1 mole of the compound Cu2CO3OH2 as follows:

The mass of Cu from periodic table is 63.55 g/mole . For 2 mole , the mass is,

m=2 mole×63.55 g/mole=127.1 g

The mass of C from periodic table is 12.01 g/mole . For 1 mole , the mass is,

m=1 mole×12.01 g/mole=12.01 g

The mass of O from periodic table is 16.00 g/mole . For 5 mole , the mass is,

m=5 mole×16.00 g/mole=80.00 g

The mass of H from periodic table is 1.008 g/mole . For 2 mole , the mass is,

m=2 mole×1.008 g/mole=2.016 g

Therefore, the total mass for 1 mole of Cu2CO3OH2 is,

total mass=127.1 g+12.01 g+80.00 g+2.016 g=221.1 g

Now, the percent composition of Cu is,

% Cu=127.1 g221.1 g×100 %=57.49 %

(c)

Interpretation Introduction

Interpretation:

The percent copper in CuO is to analyzed.

(c)

Expert Solution
Check Mark

Explanation of Solution

To determine the percent composition let the sample size be 1 mole . Now, determine the mass of each element contained in 1 mole of the compound CuO as follows:

The mass of Cu from periodic table is 63.55 g/mole . For 1 mole , the mass is,

m=1 mole×63.55 g/mole=63.55 g

The mass of O from periodic table is 16.00 g/mole . For 1 mole , the mass is,

m=1 mole×16.00 g/mole=16.00 g

Therefore, the total mass for 1 mole CuO is,

total mass=63.55 g+16.00 g=79.55 g

Now, the percent composition of Cu is,

% Cu=63.55 g79.55 g×100 %=79.89 %

(d)

Interpretation Introduction

Interpretation:

The percent copper in Cu3CO32OH2 is to analyzed.

(d)

Expert Solution
Check Mark

Explanation of Solution

To determine the percent composition, let the sample size be 1 mole . Now, determine the mass of each element contained in 1 mole of the compound Cu3CO32OH2 as follows:

The mass of Cu from periodic table is 63.55 g/mole . For 3 mole , the mass is,

m=3 mole×63.55 g/mole=190.65 g

The mass of C from periodic table is 12.01 g/mole . For 2 mole , the mass is,

m=2 mole×12.01 g/mole=24.02 g

The mass of O from periodic table is 16.00 g/mole . For 8 mole , the mass is,

m=8 mole×16.00 g/mole=128.0 g

The mass of H from periodic table is 1.008 g/mole . For 2 mole , the mass is,

m=2 mole×1.008 g/mole=2.016 g

Therefore, the total mass for 1 mole Cu3CO32OH2 is,

total mass=190.65 g+24.02+128.0 g+2.016 g=344.7 g

Now, the percent composition of Cu is,

% Cu=190.7 g344.7 g×100 %=55.32 %

Out of all the minerals, cuprite CuO has the highest percentage of copper, which is 79.84 % .

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Chapter 4 Solutions

Introduction To Chemistry 5th Edition

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