Q.1 If sulphur exists as S8 molecules,calculate the number of moles in 100g of sulphur.(S=32 u) Q.2 What weight of each element is present in 1.5 moles of sodium sulphite,Na2SO3?
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32
Q1.
Given mass = 100 grams
Molar mass = 8 x 32 = 256 Grams
No: of moles = Given mass / Molar mass
= 100 / 256
= 0.3906 moles ( approx.)
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Q2.
No: of moles = 1.5 moles
Molar mass = 2 x 23 + 32 + 3 x 16
= 126 grams
No: of moles = Given mass / Molar mass
Mass = Molar mass x No: of moles
= 126 x 1.5
= 189 grams
Given mass = 100 grams
Molar mass = 8 x 32 = 256 Grams
No: of moles = Given mass / Molar mass
= 100 / 256
= 0.3906 moles ( approx.)
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Q2.
No: of moles = 1.5 moles
Molar mass = 2 x 23 + 32 + 3 x 16
= 126 grams
No: of moles = Given mass / Molar mass
Mass = Molar mass x No: of moles
= 126 x 1.5
= 189 grams
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i don't know the answer
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