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What is the percentage of carbon in urea...

What is the percentage of carbon in urea? (Atomic mass C = 12, H = 1, N = 14, O = 16)

A

0.2

B

0.266

C

0.0667

D

0.46

Text Solution

Verified by Experts

The correct Answer is:
A
Molar mass of urea (i.e. `NH_(2)CONH_(2)`)
`=2xx`atomic mass of N+4`xx`atomic mass of H+1`xx`atomic mass of O+1`xx` atomic mass of C.
`=2xx14+4xx1+1xx16+1xx12=60` g
As we know that,
Percentage or mass % of an element
`=("Mass of that element in the compound")/("Molar mass of the compound")xx100`
`therefore` Percentage of C=`(1xx12)/60xx100=20%`
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