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Question

What is the molecular mass of a substance, each molecule of which contains 9 carbon atoms, 13 hydrogen atoms and 2.33×1023 g of other component?


A
135.04
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B
100
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C
111
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D
28
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Solution

The correct option is A 135.04

The molecule has C, H and other component. Mass of 9 C atoms =12×9=108 amu
Mass of 13 H atoms = 13×1=13 amu value of 1 amu
Mass of other component = (2.33×1023)1.66×1024=14.04
Total mass of one molecule = 108 + 13 + 14.04 = 135.04 amu
Mol. mass of substance = 135.04


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