On the periodic table of elements which group is liquid gas solid and gas in

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

The student repeated the experiment using a higher concentration of acid. the same volume of acid and the same mass of magnesium ribbon were used. what volume of hydrogen gas would have been produced after 60 seconds?

What percentage of energy used in the u.s is produced from fossil fuels