Relative to their original average energy, what is the new average energy of the molecules?
A. four times as great
B. twice as great
C. half as great
D. the same
2007-03-15 07:59:22 · 4 answers · asked by ShyGirl 1 in Science & Mathematics ➔ Physics
Ok, let's remember the equation for ideal gases :
PV = nRT
P = pressure
V = volume
n = moles
R = constant
T = temperature
at the beginning : PV = nRT
the energy of the molecules = 3/2*nRT = 3/2P*V
if the temperature is constant :
P'.V/2 = nRT = P*V, then P' = 2P, so the energy will be the same, because if the volume it's half original, the pressure will be twice original
new energy = 3/2*2P*V/2 = 3/2PV, THE SAME.
2007-03-15 08:11:43 · answer #1 · answered by anakin_louix 6 · 0⤊ 0⤋
The simple answer: Temperature is a measure of the average kinetic energy of the molecules in a gas.
Thus, if temperature does not change, energy does not change.
D. the same
2007-03-15 09:42:43 · answer #2 · answered by aconfusedkid96 2 · 1⤊ 0⤋
The same. the energy of a molecule of gaz has the form E= kT and if T is constant
2007-03-15 08:13:54 · answer #3 · answered by maussy 7 · 1⤊ 0⤋
rigidity a million x vollume a million..... rigidity 2 x vollume 2 --------------------------------- = -------------------------------- temp a million .............................. temp 2 only fil in and calculate ! good success!
2016-11-25 22:08:22 · answer #4 · answered by quire 4 · 0⤊ 0⤋