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Answer to Question #15827 in Physical Chemistry for Kevin Drake Jr

Question #15827
At a height of 312 km above the Earth's surface, an astronaut finds that the atmospheric pressure is about 1.35E-8 mmHg and the temperature is 585 K. How many molecules of gas are there per milliliter at this altitude?
Expert's answer
n/V = p/RT = 1.35E-8 mmHg / (62364 mmHg*mL/mol*K * 585 K) = 3.7E-16
N/V = n/V * N(A) = 3.7E-16 * 6.022E23 = 2.23E8 molecules/mL =
222'835'659 molecules/mL

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