What Law is this?! Plz help!?

  • Thread starter Thread starter Ashley
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Ashley

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In the reaction
CaCO3 ! CaO + CO2
100 grams of calcium carbonate (CaCO3) is
observed to decompose upon heating into 56
grams of calcium oxide (CaO) and 44 grams
of carbon dioxide (CO2).
This is an illustration of
1. the Law of Conservation of Matter.
2. the Law of Multiple Proportions.
3. the Law of Conservation of Energy.
4. the Law of Gravity
5. the conversion of matter into energy

Please and thank you
 
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