Arguments in favor of renewable energy

I actually did the math for this a while ago. In order to install solar panels to every house in America it would cost a one time payment of about 900 billion dollars. We spend 700 billion on fossil fuels each year so in two years it would already pay itself off them we'd actually profit from it. Even if you don't believe in global warming you can't argue with that.

fe 55.85 g/mol and h2o 18.02 g/mol.

the answer is c. nacl