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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One mole of aluminum consists of ______________ aluminum atoms
Fill in the blank(s) with correct word
If the temperature of a volume of ideal gas increases for 100°C to 200°C, what happens to the average kinetic energy of the molecules?
a. It halves. b. It doubles. c. It increases but less that double. d. It increases more than double.
A 0.50-mF capacitor is connected to a 400 V battery. Find the charge on the capacitor
a. 2.0 × 10^-4 C c. 1.0 × 10^-4 C b. 0.020 C d. 1.2 × 10^-12 C
An airplane has a mass of 8,000 kg and is flying at 150 m/s in level flight. The airplane drops 1,000 kg of water on a fire below. The velocity of the airplane after dropping the water is
A. 50 m/s. B. 60 m/s. C. 75 m/s. D. 100 m/s. E. 150 m/s.