Question -
What is the molecular mass of a substance, each molecule of which contains 9 carbon atoms, 13 hydrogen atoms and 2.33×10−23 g of another component?
Options:
A .  135.04
B .  100
C .  111
D .  28
Answer: Option A : A 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 = (2.33×10−23)1.66×10−24 ∴ Total mass of one molecule = 108+13+14.4=135.04 amu ∴ Mol. Mass of substance = 135.04
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