Question

Mass percentage of oxygen in hydrogen
peroxide (H2O2) is
(A) 85.2%
(B) 94.1%
(C) 75.7%
(D) 89.1%​

Answer 1

Answer:

B) 94.1 %

Explanation:

Chemical formula of hydrogen peroxide is H2O2.

Atomic mass of O is 16 u.

So mass of 2 O = 2 *16 = 32

Molecular mass of H2O2 = 2*1 + 2*16 = 34

Mass percent of O = Total mass of O in compound/ Total mass of compound * 100 = 32/34 *100 = 94.12