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Q.

Find the total number of protons in 34 mg of NH3 at STP.  (Mass of 1p=1.6726×1027kg ). 

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a

12,044×1020

b

12.044×1021

c

12.044×1023

d

12.044×1022

answer is C.

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Detailed Solution

1 mole of NH3, contains protons = 7+3 = 10 moles of 
protons (7 in N and 1 in each H atom)
=6.023×1023×10 protons 

34×103g NH3 will contain =34×103×6.023×102417=12.046×1021 protons 

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