A laboratory vacuum pump can reduce the pressure 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?

Question

Quizplus · Accepted Answer

The number of molecules in a chamber is given by the ideal gas law:PV = nRTwhere P is the pressure, V is the volume, n is the number of molecules, R is the ideal gas constant, and T is the temperature.We can rearrange this equation to solve for n:n = PV/RTPlugging in the given values, we get:n = (1.0 × 10^-7 Pa)(0.500 m^3)/(8.31 J/mol·K)(300 K)= 1.2 × 10^13 moleculesTherefore, the correct answer is A) 1.2 × 10^13.

A Laboratory Vacuum Pump Can Reduce the Pressure to 1