General Science Chemistry Basic Concepts of Chemistry

Which of the following reactions is not correct according to the law of conservation of mass. 

1
2Mg(s) + O2(g) → 2MgO(s)
2
C3H8(g) + O2(g) → CO2(g) + H2O(g)
3
P4(s) + 5O2(g) → P4O10(s)
4
More than one of the above
5
None of the above

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