Assume that an extremely inefficient electrical utility company delivers electrical energy to your home from a natural gas-burning power plant with an overall efficiency of only 31 percent and your furnace is 85 percent efficient in converting electrical energy into heat energy. what mass of natural gas the power plant must burn if heating your home requires 3.5 × 107 kj? (the heat of combustion of natural gas is 50.1 kj/g.)

The answer is solid copper 

1. why does the same side of the moon always face earthc.the rotational period of the moon is equal to one revolution around earth2. which is greater the moons period of rotation or its period of revolution  b.the moons revolution period around earth3.what was the major accomplishment of the apollo missions  c.sending the first human into space4. which of these space missions involved the deployment of lunar roversa. voyager 15. which scientists are going to explore next on kepler-186fd. evidence of existence of life6.which mission is not going to explore the outside of the solar  systemb.safir7.which technology limit the future of space explorationb. scientist must first develop certain technologies before missions can be completed.

Idon’t really understand the question i’m sorry i can’t