In chemistry, a mole is a measuring unit of atoms, molecules, ions etc. The number of moles of calcium oxide in the sample is 0.0499 moles.
A mole is a ratio of mass and the molar mass of the substance. It can measure the small number of molecules, atoms, ions etc. present in the compound.
Given,
Mass of calcium oxide = 2.80 g
Molar mass = 56.08 g/mol
Moles can be calculated as:
[tex]\begin{aligned}\rm moles &= \rm \dfrac{mass}{\rm molar \; mass}\\\\&= \dfrac{2.80}{56.08}\\\\&= 0.0499\;\rm mol\end{aligned}[/tex]
Therefore, option A. 0.0499 mol is the moles of the calcium oxide.
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