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A gas jar contains 7.2 xx 10^(20) molecu...

A gas jar contains `7.2 xx 10^(20)` molecules of `NH_(3)` gas. Find :
number of moles

Text Solution

Verified by Experts

Molecular weights of `NH_(3) = 14 + 3 = 17` a.m.u
`therefore` 1 mole of `NH_(3)` = 1 G.M.W. = 17 g
`6 xx 10^(23)` molecules of `NH_(3)` = 1 mole
1 molecule of `NH_(3)=1/6xx10^(23)xx7.2xx10^(20)`
`=1.2xx10^(-3)` moles
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