Question

Molar mass of HNO3 is 63 u, and an atomic mass of hydrogen and nitrogen are 1 u and 14 u respectively. Atomic mass of oxygen will be:
(A) 3 u
(B) 16 u
(C) 48 u
(D) 24 u

Answer 1

Answer:

its c 48u

because it (3×16)u

Answer 2

Dear Student,

◆ Answer -

(B) 16 u

● Explanation -

Molar mass of compound is sum total of atomic masses of all entities in it.

M(HNO3) = M(H) + M(N) + 3×M(O)

63 = 1 + 14 + 3M(O)

3M(O) = 63 - 15

3M(O) = 48

M(O) = 48/3

M(O) = 16 u

Therefore, atomic mass of oxygen will be 16 u.

Thanks dear. Hope this helps you...