Which property of matter is conserved in chemical reactions and shown by balanced equations?

How many liters of water vapor can be produced if 108 grams of methane gas (ch4) are combusted at 312 k and 0.98 atm? show all work. pls ! will mark as brainliest

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Can someone me with questions 15 to 17 plz.