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Question
How many grams are there in the following?
2 moles of the hydrogen molecule, H2.
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Solution
Formula = No. of moles (n) × (Gram molecular mass)
Mass of 2 moles of H2 molecule
= 2 × 2 = 4 g
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Fill in the missing data in the Table
| Species Property | H2O | CO2 | Na atom | MgCl2 |
| No. of moles | 2 | - | - | 0.5 |
| No. of particles | - | 3.011×1023 | - | - |
| Mass | 36g | - | 115 g | - |
