Calculate the number of molecules present in $5.4 \ g$ of urea (Molar mass of urea $= 60 \ g \ mol^{-1}$).
- A$5.42 \times 10^{22}$
- B$6.022 \times 10^{22}$
- C$4.312 \times 10^{22}$
- D$9.933 \times 10^{22}$
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