A laboratory vacuum pump can reduce the pressure in a chamber to 1.0 × 10-7 Pa
If the volume of the chamber is 0.500 m3 and the temperature is 27°C, how many molecules are left inside the chamber? (NA = 6.022 × 1023 molecules/mol, R = 8.31 J/mol ? K)
A) 1.2 × 1013
B) 2.4 × 1013
C) 1.2 × 1012
D) 2.4 × 1012
E) 1.2 × 1014
A
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