Number of moles of ammonia in 3.00 g = 3.00/17 mol
= 0.1764 mol
Molecular mass of SO3 = 1 × 32 u + 3 × 16 u = 80 u
1 mole of SO3 weighs 80 g
∴ 0.1764 moles weigh = 80 x 0.1764 g
= 14.11 g
Question
A sample of ammonia weighs 3.00 g. What mass of sulphur trioxide contains the same number of molecules as are in 3.00 g ammonia?
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Open Answer »A colorless liquid is thought to be a pure compound. Analysis of three samples of the material yield the following results.
| Mass of Sample | Mass of carbon | Mass of Hydrogen | |
| Sample 1 | 1.0 g | 0.862 g | 0.138 g |
| Sample 2 | 1.549 g | 1.335 g | 0.214 g |
| Sample 3 | 0.988 g | 0.852 g | 0.136 g |