Answers

2015-11-24T19:34:12+05:30
Atomic mass of nitrogen is 14
molar mass of  N_{2} is 14×2 = 28×0.5=14g
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2015-11-24T19:35:38+05:30
mass of 1 mole of nitrogen gas (N₂ ) = 14 * 2 = 28 gram 
therefore mass in 0.5 moles is , 
= 28 * 0.5 
= 14 .0 
therefore mass of 0.5 moles of N₂ = 14 grams .
                 i hope it helps.........................^_^
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i have no account on fb 
hmm
can u say the significance that we get from water?
der?
i don't know sry :)