Exercise ::
Moles, Density & Concentration
| Answer: Option A |
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| Explanation: |
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Molecular weight of NaHCO3 = 84 grams, => number of moles = 42/84 = 0.5. |
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| Answer: Option C |
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| Explanation: |
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Molecular weight of CaOCl2 = 127, => number of moles = 369/127 = 3. |
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4. | Which of the following has the same number of moles as in 398 grams of CuSO4 ? |
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| A. | 2 grams of hydrogen |
| B. | 40 grams of oxygen |
| C. | 35 grams of nitrogen |
| D. | 58.5 grams of Sodium chloride |
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| Answer: Option B |
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| Explanation: |
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Number of moles of CuSO4 = 398/ 159 ≈ 2.5, and number of moles of oxygen = 40/16 = 2.5. |
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5. | What are the number of moles of Hydrogen in 158 grams of Ammonium Bicarbonate ? |
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| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
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| Answer: Option B |
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| Explanation: |
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Molecular Weight of ammonium bicarbonate (NH4HCO3) = 79 grams, => moles = 158/79 = 2, => Number of moles of hydrogen = 2* 5 = 10. |
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