Question

Choose all of the chemical reactions which correctly show that chemical reactions must obey the Law of Conservation of Matter.
CH4 + 2O2 → CO2 + 2H2O
H2 + O2 → H2O
C6H12O6 + 6O2 → 6CO2 + 6H2O
2CO + O2 → 2CO2
4P + O2 P4O10

Answer 1

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Answer 2

According to this law, during any physical or chemical change, the total mass of the products remains equal to the total mass of the reactants.

so 1st and 3rd one are equal according to the law of conservation of matter

and 2nd and 4th one are not equal according to the law of conservation of matter