12. Which of the following quantities contains the greatest number of moles?
A) 30 g N2
B) 35 g NH3
C) 60 g NaCl
D) 75 g CaO
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Answer:b
Explanation:you have to calculate no of moles of each which is equal to given mass by gmm
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molecular mass of N2 is 28
no. of moles of N2 = 30/ 28
molecular mass of NH3= 17
no. of moles of NH3 = 35/17
molecular mass of NaCl=58.5
no. of moles of NaCl= 60/58.5
molecular mass of CaO= 56
no. of moles of CaO = 75/56
therefore no. of moles of NH3 is highest (2.05) .
thank you
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