Answered

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A canister filled with 7.8 mol of single-atom helium gas has a temperature of
290 K. What is the approximate total internal energy of the gas? (Recall that
3
the equation for kinetic energy due to translation in a gas is: nRT, the
2
equation for kinetic energy due to rotation of a molecule in a gas is: nRT, and
R = 8.31 J/(mol-K).)
O A. 15,100 J
O B. 9800 J
O C. 28,200 J
O D. 12,500 j

Sagot :

n=7.8 mol
R=8.31 J/(mol-k)
T=290K
Formula for internal energy=3/2(nRT)
Therefore the approximate total internal energy= 3/2 * (7.8 * 8.31 * 290)=28195.83J
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