Calculate the mass fractions of the element oxygen in the substances
June 21, 2021 | education
| Calculate the mass fractions of the element oxygen in the substances (round the result to an integer) a) H2SO3 b) KOH c) N2O5 d) Na2CO3 e) Fe2O3
a) w (O) = m (O): Mr (H2SO3) × 100% = 48: 82 × 100% = 59%.
b) w (O) = m (O): Mr (KOH) × 100% = 16: 56 × 100% = 29%.
c) w (O) = m (O): Mr (N2O5) × 100% = 80: 108 × 100% = 74%.
d) w (O) = m (O): Mr (Na2CO3) × 100% = 48: 106 × 100% = 45%.
e) w (O) = m (O): Mr (Fe2O3) × 100% = 48: 160 × 100% = 30%.
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