The height of three peaks; A, B, and C obtained in a gas chromatogram are 25.1 mm, 14.5 mm and 37.1 mm. The width of the peaks, at half height, are 4.6 mm, 4.4 mm and 5.9 mm, respectively. Calculate the percentage composition of A in the sample.

Percentage Compositon Of A in the sample= 28.99%

Explanation:

First we calculate the Peak area.

Because each peak is consdered like a triangle in a Chromatogram, The Area of the peak is calculated as  = height x half height of the width

Area of Pea A= 25.1 mm X 4.6mm=115.46mm2

Area of Peak B= 14.5mm x 4.4mm=63.8mm2

Area of PeaK C=  37.1mm x5.9mm =218.89mm2

Total Peak Area=  398.15mm2

Percentage Area of Peak A =  Area of Peak A/Total Peak Area x 100

= 115.46 / 398.15  x 100

=0.2899 x 100

=28.99%

Percentage Compositon Of A = 28.99%

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.