Areversible cycle executed by 1 mol of an ideal gas for which cp=(5/2)r and cv=(3/2)r consists of the following steps operated in a piston and cylinder arrangement:
a) starting at 600 k and 2 bar, the gas is cooled at constant pressure to 300 k.
b) from 300 k and 2 bar, the gas is compressed isothermally to 4 bar.
c) the gas returns to its initial state along a path for which the product pt is constant.
draw the cycle with each step clearly labeled on both a p-t diagram and a p-v diagram. calculate q, w, and δu for each step of the cycle.

the answer would be a

the answer is c.the valence of the atoms combine .

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o

4d^55s^1 ( third choice)