Carbon Dioxide is a compound gas
Carbon Dioxide is a gas produced by burning carbon and organic compounds and by respiration.
<span>of, relating to, affecting, or consisting of a vessel or vessels, especially those that carry blood</span>
0.986 moles of CaO are formed when 98.60 g of
decomposes.
<h3>What are moles?</h3>
A mole is defined as 6.02214076 ×
of some chemical unit, be it atoms, molecules, ions, or others.
Number of moles of CaCO3 =
Number of moles of CaCO3 = 
= 0.986 moles
Reaction:
→ 
Since the reaction is 1:1:1.
So 0.986 moles of CaO are formed.
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There are 3 significant figures.