A gas in a cylinder with a moveable piston expands from 0.255 L to 0.892 L
against a constant external pressure of 0.987 atm. In this process, the
piston cools from 23.5°C to 22.6°C. What is the total change in internal
energy for the system (gas in cylinder)? Assume the specific heat capacity
of the piston is 0.88 J/g.°C and it has a mass of 1.25 kg.

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided