4. Use R = 8.2 × 10⁻⁵ m³·atm·mol⁻¹·K⁻¹ and Nₐ = 6.02 × 10²³ mol⁻¹. The approximate number of air molecules in a 1 m³ volume at room temperature (300 K) and atmospheric pressure is:
(A) 2.2 × 10²⁰
(B) 2.4 × 10²⁵
(C) 2.7 × 10²⁶
(D) 5.4 × 10²⁸
(E) 2.2 × 10³⁰

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