Calculate the relative molecular weight: Fe, O2, NO, Fe2O3, Na2So4.
| April 3, 2021 | education
Relative molecular weight (Mr) is a physical quantity equal to the ratio of the mass of one molecule of a substance to 1/12 of the mass of a carbon atom.
Mr (Fe) = 56 * 1 = 56.
Mr (O2) = 16 * 2 = 32.
Mr (NO) = 14 * 1 + 16 * 1 = 30.
Mr (Fe2O3) = 56 * 2 + 16 * 3 = 112 + 48 = 160.
Mr (Na2SO4) = 23 * 2 + 32 * 1 + 16 * 4 = 46 +32 + 64 = 142.
Answer: Mr (Fe) = 56, Mr (O2) = 32, Mr (NO) = 30, Mr (Fe2O3) = 160, Mr (Na2SO4) = 142.
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