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Question

Chemistry Question on Some basic concepts of chemistry

Volume of a gas at STP is 1.12×10−71.12 \times 10^{-7} cc.Calculate the no. of molecules in it

A

3.01×10203.01 \times 10^{20}

B

3.01×10123.01 \times 10^{12}

C

3.01×10233.01 \times 10^{23}

D

3.01×10243.01 \times 10^{24}

Answer

3.01×10123.01 \times 10^{12}

Explanation

Solution

No. of molecules =1.12×10722,400g=\frac{1.12\times10^{7}}{22,400}g =10−9200=\frac{10^{-9}}{200} =0.5×10−11=0.5\times 10^{-11} moles =0.5×10−11×6.02×1023=0.5\times10^-{11}\times6.02\times10^{23} =3.01×1012=3.01\times 10^{12} molecules