Answer: Balance
Explanation: Mass is the amount of matter contained in a body.
Decomposition reaction results in the formation of the products by splitting the reactants. Moles of mercury(ii) oxide needed are 15.63 moles.
<h3>What are moles?</h3>
Moles are the ratio of mass and the molar mass of the compound or the molecule.
Moles of oxygen are calculated as:

The balanced chemical reaction can be shown as,

From the reaction, it can be said that 1 mole of oxygen requires 2 moles of mercury oxide.
Moles of mercury oxide are calculated as:

Therefore, option C. 15.63 moles of mercury (II) oxide is needed.
Learn more about moles here:
brainly.com/question/26898237
There should be 3 valence electrons surrounding the aluminum ion
Answer:
true
Explanation:
because if you really take a moment to think about it atoms are made of molecules.
<u>Answer </u><u>:</u><u> </u>
As Per Given Information
Given volume of O₂ is 53 L
We've been asked to find the number of moles of O₂ gas contained
For finding the number of moles the following formulae is use

Put the given value we obtain

So, the number of moles is 2.366 .