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
You might also like to view...
The principal advantage of ac power over dc power is that
A) more energy is dissipated during transmission. B) ac voltage oscillates while dc voltage does not. C) ac voltage can be transformed via conventional transformers. D) ac circuits multiply power more easily. E) ac circuits are safer.
A gray transparent surface has the spectral reflectivity shown. Determine the average reflectivity and transmissivity at 500 K and at 850 K.
If the net force on a body is zero, the net torque on the body is
A. not necessarily zero. B. always zero. C. certainly not zero.
An astronaut in a rocket moving with a speed v = 0.6c relative to Earth performs a collision experiment with two small steel balls and concludes the both momentum and energy are conserved. What would an Earth observer conclude?
A. only momentum is conserved B. only energy is conserved C. neither energy or momentum is conserved D. both energy and momentum are conserved