7. [-/1 Points] DETAILS SERPSE10 19.A.OP.033. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A ceramic heating element is immersed in an insulated container of liquid methane at its boiling point. If the heating element generates 70.0 j of heat energy per second, how many kilograms of methane are boiled away in a period of 7.00 h? The heat of vaporization and boiling point respectively for methane are 481 kJ/kg and -162.C. kg Need Help? Read It 8. [-/2 Points] DETAILS SERPSE10 19.A.OP.035. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER You purchase a corndog from a street vendor on a cold day. The vendor gives you change which contains 11.0 g of silver at - 12.0C and you put it in your parka pocket which contains 20.0 g of copper coins at 30.0.C. A short time later, the silver is warming the rate of 0.50.C/s and has warmed to 4.00C. The specific heat of copper and silver are, respectively, 387 3/(kg . .C) and 234 3/(kg . .C). At this time, determine the following. (Assume the pocket of your parka is thermally isolated from the environment.) (a) temperature of the copper coins (in .C) .C (b) rate of change of the temperature (in C/s) of the copper coins .C/S Need Help? Read It 9. [-/2 Points] DETAILS SERPSE10 19.A.P.029.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Gas in a container is at a pressure of 5.20 atm and a volume of 1.40 m3. (a) What is the work done on the gas if it expands at constant pressure to twice its initial volume? (b) What is the work done on the gas if it is compressed at constant pressure to one-quarter of its initial volume? Need Help? Read It Master It