Question

The volume of a gas in discharge tube is $$\displaystyle 1.12\times 10^{-7}\ mL$$ at $$STP$$. Then the number of molecules of gas in the tube is -

A
3.01×104
B
3.01×1015
C
3.01×1012
D
3.01×1016

Solution

The correct option is D $$\displaystyle 3.01\times 10^{12}$$As in $$22400\: mL$$ there is $$1\: mol$$,So,  number  of  moles  in  $$1.1\times 10^{-7} mL$$,  will  have  moles  as  follows:Number of moles = $$\displaystyle \frac{1.12\times 10^{-7}}{22400}$$So, the number of molecules = $$\displaystyle \frac{1.12\times 10^{-7}}{22400}\times N_{A} = 3.01\times 10^{12}$$As $$N_A=$$ $$6.022\times 10^{23}$$Chemistry

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