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(ii) Calculate the number of molecules of sulphur (S8) present in 128gm of sulphur.(atomic mass of Sulphur is32gm). |
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Answer» The MOLECULES formula of sulphur is given to be S8 ( it Contains 8 atoms of sulphur ). So , the molecular mass of sulphur molecule is 32 × 8 = 256 U. This means that 1 MOLE of sulphur molecules is equal to 256 GRAMS. Now, 256 g of sulphur = 1 mole of sulphur moleculesSo, 16 g of sulphur = 1/ 256 × 16 mole of sulphur molecules = 0.0625 mole of sulphur molecules Also, 1 mole of sulphur molecules = 6.023 × 10²³ molecules So, 0.0625 mole of sulphur molecules = 6.025 × 10²³ × 0.0625 molecules= 3.76 × 10²² molecules |
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