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Answer:
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a) Percentage Composition:
1. Oxygen in Sulphuric Acid (H2SO4):
- Molecular mass of H2SO4 = 2(1) + 32 + 4(16) = 98 g/mol
- Oxygen's contribution = (4 * 16) / 98 * 100% = 64/98 * 100% ≈ 65.31%
2. Carbon in Sugar:
- There are different types of sugar, but for simplicity, let's consider sucrose (table sugar) with the formula C12H22O11.
- Molecular mass of C12H22O11 = 12(12) + 22(1) + 11(16) = 342 g/mol
- Carbon's contribution = (12 * 12) / 342 * 100% ≈ 42.11%
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b) Empirical Formulas:
1. Benzene (C6H6):
- The empirical formula is the simplest whole number ratio of atoms in a compound, so for benzene, C6H6, the ratio is 1:1, making the empirical formula CH.
2. Sugar (assuming sucrose, C12H22O11):
- The empirical formula of sugar is CH2O.
3. Hydrogen Peroxide (H2O2):
- The empirical formula of hydrogen peroxide is HO.
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QI. Molecular Mass Calculation:
3. Sodium Zincate (Na2ZnO2):
- Molecular mass = 2(23) + 65 + 2(16) = 23 + 23 + 65 + 32 = 143 g/mol
4. Aluminium Nitride (AlN):
- Molecular mass = 27 + 14 = 41 g/mol
5. Ferrous Chloride (FeCl2):
- Molecular mass = 56 + 2(35.5) = 56 + 71 = 127 g/mol
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I hope this breakdown helps.