You have obtained a gas chromatogram of a two component mixture of compounds A and B. The height of peak A is 3.84 cm. and the width at half height is 1 cm. The height of peak B is 3.49 cm. and the width at half height is 1.36 cm. The percentage of a component in the mixture is proportional to peak area. Estimate peak areas by multiplying height by width at half height. What was the percentage of compound B in the mixture? (Enter your answer as a number without any percent symbol or the word percent.)

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Asked Sep 28, 2019
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You have obtained a gas chromatogram of a two component mixture of compounds A and B. The height of peak A is 3.84 cm. and the width at half height is 1 cm. The height of peak B is 3.49 cm. and the width at half height is 1.36 cm. The percentage of a component in the mixture is proportional to peak area. Estimate peak areas by multiplying height by width at half height. What was the percentage of compound B in the mixture? (Enter your answer as a number without any percent symbol or the word percent.)

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Expert Answer

Step 1

Given,

Height of peak A = 3.84 cm

Width of A at half height = 1 cm

Height of peak B = 3.49 cm

Width of B at half height = 1.36 cm

The percentage of a component in the mixture is proportional to peak area. Peak areas is to be estimated by multiplying height by width at half height.

Step 2

Therefore, peak area of A and B can be calculated as:

Peak area of A height x width at half height
3.84 cm x 1 cm = 3.84 cm2
Peak area of B height
width at half height
x
= 3.49 cm x 1.36 cm
4.75 cm2
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Peak area of A height x width at half height 3.84 cm x 1 cm = 3.84 cm2 Peak area of B height width at half height x = 3.49 cm x 1.36 cm 4.75 cm2

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Step 3

Total peak area = 3.84 cm2 + 4.75 cm2 = 8.59 cm2

The percentage of compound ...

Peak area of B
Percentage of compound B
x 100%
Total peak area
4.75 cm2
Percentage of compound B
x 100%55.3 %
8.59 cm2
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Peak area of B Percentage of compound B x 100% Total peak area 4.75 cm2 Percentage of compound B x 100%55.3 % 8.59 cm2

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