The chart shows data for four heat engines. Heat Engine
W
Х
Y
Z
Th (K)
620
840
900
500
T. (K)
120
100
300
25
Which lists the engines from most efficient to least efficient?
OY, X, W, Z
OZ, W, X, Y
OZ, X, W, Y
OY, W, X, z
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An engine undergoes a cycle as shown in the diagram. during a complete cycle the work done by the gas is 28.5×103 j and the energy transferred thermally out is 99.4×103 j. there are 1.5×1024 gas molecules and they have three active degrees of freedom. 6. (6 pts) during which process(es) is energy transferred thermally into the gas? a. 1→2 b. 2→3 c. 4→1 d. 1→2 and 4→1 e. none of the above

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Use vsepr theory to predict the molecular geometry of the molecule hcn.