In the following image, atoms are represented by colored circles. Different colors represent different types of atoms. If atoms are touching, they are bonded.
Which of the following boxes shows a mixture of different compounds?
A
B
C
E

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.