How many molecules of oxygen would occupy a volume of 2.24 cm${}^3$ at s.t.p?
[Molar volume at s.t.p = 22,400 cm${}^3$, Avogadro's number = 6.02 x 10${}^{23}$]

A. 3.01 x 10${}^{20}$
B. 3.01 x 10${}^{27}$
C. 6.02 x 10${}^{19}$  
D. 6.02 x 10${}^{27}$

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Correct Answer: C