Determine the mass fractions of hydrogen and oxygen in hydrogen peroxide H2O2.

Given:
H2O2
w (H) =?
w (O) =?

Solution:
1) Mr (H2O2) = 2 * 1 + 16 * 2 = 34
2) w (H) = 2/34 = 0.06
3) w (O) = 32/34 = 0.94

Answer: 0.06 and 0.94



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