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Question

Chemistry Question on Some basic concepts of chemistry

Which of the following has smallest number of molecules ?

A

11.2 L11.2\, L of O2O_2 at NTPNTP

B

8.0 g8.0\,g of O2O_2

C

0.1 mole0.1 \,mole of O2O_2

D

2.24×104 mL2.24 \times 10^4\, mL of O2O_2

Answer

0.1 mole0.1 \,mole of O2O_2

Explanation

Solution

(a) Number of molecules in 11.2 L11.2\,L of O2O_{2}
11.222.4×6.023×1023\frac{11.2}{22.4}\times 6.023\times 10^{23}
=0.5×NA=0.5\times N_{A}
(b) Number of molecules in 8.0 g8.0 \,g of O2O_{2}
=8.032×6.023×1023=\frac{8.0}{32}\times6.023\times10^{23}
=0.25×NA=0.25\times N_{A}
(c) Number of molecules in 0.10.1 mole of O2O_{2}
=0.1×6.023×1023=0.1\times 6.023\times 10^{23}
=0.1×NA=0.1\times N_{A}
(d) Number of molecules in 2.24×104 mL2.24\times 10^{4}\,mL of O2O_{2}
=2.24×10422400×6.023×1023=\frac{2.24\times 10^{4}}{22400} \times 6.023\times 10^{23}
=NA=N_{A}
Thus, 0.10.1 mole of O2O_{2} contains smallest number of molecules