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ehidna [41]
2 years ago
10

2H2 + O2 → 2H2O

Chemistry
1 answer:
pantera1 [17]2 years ago
6 0
Okay
Mr (H2O)= 18g
therefore moles of H2O
is 720.8/18= 40.04mol
the ratio of H2 to O2 to H2O is
2 : 1 : 2
so moles of H2 is same as H2O here
H2= 40.04moles

moles of O2 is half
so 40.04 x 0.5
20.02moles

grams of O2 is
its moles into Mr of O2
that's 20.02 x 32 = 640.64g

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D.The products will have at least 2 Na atoms and 1 O atom.

<h3>Further explanation </h3>

Conservation of mass states that  

<em>In a closed system, the masses before and after the reaction are the same </em>

So it can be concluded

  • mass of the reactants = mass of the products
  • mass cannot be created or destroyed
  • The number of atoms involved in a reaction remains the same⇒ number of moles also the same
  • chemical equation in balanced form

So the number of atoms in reactants and products remains the same

Because one of the reactants in a reaction is Na₂O, so <em>The products will have at least 2 Na atoms and 1 O atom.</em>

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Read 2 more answers
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