Question 12 (5 points)
(05.03 mc)
what is the percentage composition of each element in ammonia, nh3? (5 points)
a 82.35% n; 17.65% h
b 80.55% n; 19.45% h
c 79.46% n; 20.54% h
d 78.57% n; 21.43% h

Answer : The correct option is, (A) 82.35% N; 17.65% H

Explanation :

Percent composition : It is calculated by dividing the mass of each element in one mole of the compound that means dividing the mass of each element by the total molar mass of the compound.

Formula used :

The given molecule is,

Molar mass of H = 1 g/mole

Molar mass of N = 14 g/mole

First we have to calculate the molar mass of .

Molar mass of glucose =

Now we have to calculate the percent composition of nitrogen and hydrogen in .  

As we now that there are 1 number of nitrogen atom and 3 number of hydrogen atoms.

Now put all the given values in this formula, we get:

and,

Now put all the given values in this formula, we get:

Therefore, the percent composition of nitrogen and hydrogen in is, 82.35 % and 17.65 % respectively.

i believe the answer is a.