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You are provided with a compound composed of 22.2%zinc,11.6%sulphur,22.3%oxygen and the rest percentageis water of crystallization.calculate the molecularformula atthecompoundifits molecularmassis161?
You are provided with a compound composed of 22.2%zinc,11.6%sulphur,22.3%oxygen and the rest percentageis water of crystallization.calculate the molecularformula atthecompoundifits molecularmassis161?
3. Determine the mole ratio of each element: - Zinc (Zn): 0.34 / 0.34 = 1 - Sulphur (S): 0.36 / 0.34 ≈ 1 - Oxygen (O): 1.39 / 0.34 ≈ 4 - Water (H2O): 2.44 / 0.34 ≈ 7
4. Find the simplest whole number ratio: - Zinc (Zn): 1 - Sulphur (S): 1 - Oxygen (O): 4 - Water (H2O): 7
5. Write the empirical formula: ZnSO4.7H2O
6. Calculate the molar mass of the empirical formula: - ZnSO4: (65.38 + 32.06 + 4*16.00) = 161.44 g/mol - 7H2O: 7*(2*1.01 + 16.00) = 126.14 g/mol - Total molar mass: 161.44 + 126.14 = 287.58 g/mol
7. Determine the molecular formula: - Molecular mass given: 161 g/mol - Molecular mass of empirical formula: 287.58 g/mol - Molecular formula: (161/287.58) * ZnSO4.7H2O = ZnSO4.4H2O
Therefore, the molecular formula of the compound is ZnSO4.4H2O.
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Google Gemini AI
5 days ago
Step 1: Calculate the empirical formula
The empirical formula represents the simplest whole number ratio of elements in a compound. To determine the empirical formula, we need to find the moles of each element present:
- Moles of Zn = (22.2 g / 65.4 g/mol) = 0.339 - Moles of S = (11.6 g / 32.1 g/mol) = 0.361 - Moles of O = (22.3 g / 16.0 g/mol) = 1.39
Dividing each by the smallest number of moles (0.339):