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What are the number of moles of hydrogen in NH4[Cr(SCN)4(NH3)2] if the weight of nitrogen in it is 49 grams?(a) 3.5(b) 5(c) 7(d) 10I got this question in a national level competition.Origin of the question is The Mole topic in section Moles, Density & Concentration of Basic Chemical Engineering

Answer»

The correct choice is (B) 5

For EXPLANATION I WOULD SAY: Moles of nitrogen = 49/14 = 3.5, => moles ofNH4[Cr(SCN)4(NH3)2] = 3.5/7 = 0.5, => moles of hydrogen = 0.5*10 = 5.



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