question 3
what does the law of conservation of mass say?
the mass of the products in a chemical reaction is unrelated to the mass of the reactants.
the mass of the reactants is greater than the mass of the products in a chemical reaction.
the mass of the products in a chemical reaction is equal to the mass of the reactants.
the mass of the reactants is less than the mass of the products in a chemical reaction.
question 4
which of the following equations is balanced?
p + 2o₂ → po₂
4p + 2o₂ → 2p₄o₅
4p + 5o₂ → 2p₂o₅
p + o₂ → p₂o₅

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### Question 3
# Brief Explanations:
The law of conservation of mass states that in a chemical reaction, mass is neither created nor destroyed. This means the total mass of the reactants must equal the total mass of the products.
# Answer:
The mass of the products in a chemical reaction is equal to the mass of the reactants.

### Question 4
# Brief Explanations:
- For $P + 2O_2\to PO_2$:
  - Reactants: $1$ $P$ atom and $4$ $O$ atoms ($2\times2$).
  - Products: $1$ $P$ atom and $2$ $O$ atoms. Not balanced.
- For $4P+2O_2\to 2P_4O_5$:
  - Reactants: $4$ $P$ atoms and $4$ $O$ atoms ($2\times2$).
  - Products: $8$ $P$ atoms ($2\times4$) and $10$ $O$ atoms ($2\times5$). Not balanced.
- For $4P + 5O_2\to 2P_2O_5$:
  - Reactants: $4$ $P$ atoms and $10$ $O$ atoms ($5\times2$).
  - Products: $4$ $P$ atoms ($2\times2$) and $10$ $O$ atoms ($2\times5$). Balanced.
- For $P+O_2\to P_2O_5$:
  - Reactants: $1$ $P$ atom and $2$ $O$ atoms.
  - Products: $2$ $P$ atoms and $5$ $O$ atoms. Not balanced.
# Answer:
$4P + 5O_2\to 2P_2O_5$

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