Dmitri Mendeleev invented the periodic table.
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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 .
Answer:
5 mL
Explanation:
When an object is completely submerged in a liquid , it displaces liquid equal to its volume . Therefore level of liquid is raised in a container containing liquid .
When the irregularly shaped object is totally submerged the volume of water in a graduated cylinder increases from 10 mL to 15 mL.
Initially volume of water contained = 10 mL
volume of water + volume of irregular shaped object = 15 mL
volume of irregular shaped object = 15 - 10 = 5 mL .