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Find out the number of moles of molecule...

Find out the number of moles of molecules present in the samples given below. (GMM - `N_2` = 28g, `H_2 O = 18g` )
a) 56g `N_2`
b) `90g H_2 O`

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a) No. of moles = (given mass in grams)/(GMM)
`56gN_2 = (56/28) = 2 mole`
b) No. of moles = (Given mass in grams)/(GMM)
`90g H_2 O = (98/18) =5mole`
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