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Question

Which of the following contains the maximum number of molecules?

A
200 cc of at S.T.P
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B
150 cc of at S.T.P
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C
50 cc of at S.T
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D
150 cc of at S.T.P
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Solution

The correct option is A 200 cc of at S.T.P
1 litre = 1000 cm3 = 1000 cc
We know that, volume of 1 mole of gas at S.T.P = 22.4 L = 22400 cm3 = 24000 cc.
200 cc of NH3 at S.T.P contains (6.022×1023×200)22400=0.0537×1023 molecules
150 cc of N2 at S.T.P and 150 cc of O2 at S.T.P (6.022×1023×150)22400=0.0403×1023 molecules
50 cc of SO2 at S.T.P (6.022×1023×50)22400=0.013×1023 molecules
Therefore correct answer is 200 cc of NH3 at S.T.P

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