1.

Calculate the number of molecules of sulphur (S_(8)) present in 16 g of solid sulphur.

Answer»

Solution :Atomic mass of sulphur = 32 G
`:.` molar mass of sulphur `(S_(8)) = 32 xx 8` = 256 g
Given mass of sulphur = 16 g
The number of molecules = `("given mass")/("molar mass") xx "Avogadro number"`
`= (16)/(256) xx 6.022 xx 10^(23)`
`~~ 0.376 xx 10^(23)`
`= 3.76 xx 10^(22)`
The number of molecules PRESENT in 16G of sulphur is `3.76 xx 10^(22)`


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