%C= 12/12 + 2·16=0,273=27,3%.
8.4 moles equals 469.14g Fe
It is option A 4s cause n=4, l=1 this is 4s orbital
It also depends on what we use to make the energy in the power plants. Many use uranium which is non renewable. A better alternative would be wind or solar as it is always around. Hope this helps.
I think it’s called condensation or water vapor