Q.

Volume of a gas at STP is 1.12  ×  10−7  cc. Calculate the number of molecules in it

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a

3.01  ×  1020

b

3.0  ×  1012

c

3.01  ×  1023

d

3.0  ×  1024

answer is B.

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Detailed Solution

∵   22400  cc  of  gas  at STP has  6  ×  1023  molecules∴  1.12  ×  10−7  of  gas  at  STP has  6  ×  1023 × 1.12  × 10−7 22400                                                   =   3  ×  1012.
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Volume of a gas at STP is 1.12  ×  10−7  cc. Calculate the number of molecules in it