Which of these chemical equations is balanced correctly? 2H2 + O → H2O

2H2 + O → H2O

C3H8 + 5O2 → 3CO2 + 4H2O

C3H8 + 5O2 → 3CO2 + 4H2O

N + 3H2 → 2NH3

N + 3H2 → 2NH3

C3H8 + 4O2 → 3CO2 + 4 H2O

The balanced  chemical equation :

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Conservation of mass applies to a closed system, where the masses before and after the reaction are the same, so balanced chemical equations show that mass is conserved in chemical reactions.

So we just have to look at the amount of each type of element present in the reactants and products must be the same

1. 2H₂ + O → H₂O

not balanced, because element H not equal(4 in left, 2 in right)

2. C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

balanced, because  elements in reactant and product are the same

3. N + 3H₂ → 2NH₃

not balanced, because element N not equal(1 in left, 2 in right)

4. C₃H₈ + 4O₂ → 3CO₂ + 4H₂O

not balanced, because element O not equal(8 in left, 10 in right)

answer; talc and gypsum;

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