Question

The percentage of carbon by mass in urea (NH2CONH2) is
(1) 40 (2) 25 (3) 60 (4) 20​

Answer 1

Answer:

The percentage of carbon by mass in urea (NH2CONH) is 40...

this is a answer ok ARMY

Answer 2

Answer:

$(4)20$

Formula for calculating percentage by mass:-

$\frac{Ar \: of \: the \: element \times No. \: of \: atoms}{Mr \: of \: compound} \times 100$

$\frac{12 \times 1}{60} \times 100$

$\frac{12}{60} \times 100$

$\frac{12}{6} \times 100$

$2 \times 10$

$= 20$

Hence, proved that the percentage of carbon by mass in urea is 20.