The pressure of interstellar space is about 4.0 * 10^-22 atm. If the temperature is 3 K, how many molecules are present per litre? (R = 0.08 l-atm/K-mol)

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Prashant Kotian · Accepted Answer

Correct answer: D. Concentration n/V = P / RT = 4.0 * 10^-22 / (0.08 * 3) = 1.667 * 10^-21 mol/l. Molecules per litre = (n/V) * N_A = 1.667 * 10^-21 * 6.022 * 10^23 = 1003.7 ≈ 1002.

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