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Isotopes, Isotones and Isobars

The molecular...

Question

The molecular mass of $(N H_{2})_{2} C O$ is :
(Given atomic mass of H = 1, O = 16, C = 12, N = 14.)

A

90 g m / m o l e

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B

80 g m / m o l e

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C

60 g m / m o l e

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D

62 g m / m o l e

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Solution

The correct option is D $60 g m / m o l e$
Molar mass
$(N H_{2})_{2} C O = 2 \times (14 + 2) + 12 + 16 = 60 g m / m o l e$

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Q. Some data related to mole concept at STP is given. Complete the table.

a)	64 g $O_{2} \Rightarrow$	................. moles of $O_{2}$
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