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Q.

500 ml of NH3 contains 6.00 x 1023 molecules at S.T.P. How many molecules are present in 100 ml of CO2 at S.T.P.

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a

6 x 1023

b

1.5 x 1023

c

1.2 x 1023

d

None of these

answer is C.

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Detailed Solution

PV1n1RT=PV2n2RT or, V1n1=V2n2or, 5001=100n2 or, n2=15[6.0 x 1023 molecules of NH3=1 mole] 1 mole of CO2 contains 6.0 x 1023 molecules∴15 mole of CO2 contains 1.2 x 1023 molecules.
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