They make finding things easier so we plug abs don’t need to go on the other planets and can just send the -robots
Coal can replace petroleum base fuel when you are just heating something that dont need big amount of heat. examples of it is when producing steam, coal is just used to heat water and produce steam because coal is much cheaper and the coal can already do the job in heating the water
N(Na)=0.255 mol
M(Na)=22.990 g/mol
m(Na)=n(Na)M(Na)
m(Na)=0.255*22.990=5.862 g