What is the number of molecules in $0.082 \ L$ of an ideal gas kept at a temperature of $400 \ K$ and a pressure of $10 \ atm$?
- A$1.5 \times 10^{23}$
- B$3 \times 10^{23}$
- C$1.5 \times 10^{22}$
- D$2.5 \times 10^{21}$
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