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What is the number of molecules in 8g CH_(4)?

Answer»

SOLUTION :Given mass of `CH_(4)` = 8 g,
MOLAR mass of `CH_(4) = 12 + (4 xx 1)` =12 + 4 =16g
The number of molecules = `("given mass")/("molar mass") xx "AVOGADRO number"`
`=(8)/(16) xx 6.022 xx 10^(23)`
`= 3.011 xx 10^(23)`
The number of molecules in 8 g `CH_(4) = 3.011 xx 10^(23)`


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