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Please !!
Which of the following chemical equations follows the law of conservation of mass ?
A.P₄O₁₀ + 6H₂O → 2H₃PO₄
B.2Al(OH)₃ + 2H₂SO₄ → AI₂(SO4)₃ + 6H₂O
C.Ba₃N₂ → 2Ba + N₂
D.12HCO₄ + P₄O₁₀ → 4H₃PO₄ + 6CI₂O₇

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