Answer: -
2.5 moles of calcium atoms are in 2.5 moles of calcium carbonate CaCO₃
Explanation: -
In order to solve such types of problems, the first step would be to write the chemical formula of the compound.
The chemical formula of calcium carbonate = CaCO₃
The chemical symbol of Calcium is Ca.
From the formula of calcium carbonate we can see that
1 mole of CaCO₃ has 1 mole of Ca
2.5 mole of CaCO₃ has [tex] \frac{1 mole Ca }{1 mole CaCO₃} x 2.5 mole CaCO₃ [/tex]
= 2.5 mol of Ca.
∴2.5 moles of calcium atoms are in 2.5 moles of calcium carbonate CaCO₃
Moles are the mass and the molecular mass ratio of the substance. In 2.5 moles of calcium carbonate, 2.5 moles of calcium atoms are present.
Moles are the units of the calculation of the number of molecules and atoms in a substance. Molar mass is the addition of all the constituent atomic mass of the compound.
The chemical formula for calcium carbonate is [tex]\rm CaCO_{3}.[/tex] From this, it can be said that,
1 mole of calcium carbonate contains 1 mole of calcium
So, 2.5 moles of calcium carbonate will contain x moles of calcium
Solving for x:
[tex]\begin{aligned} \text{moles of x} &= 2.5 \;\rm moles \times \dfrac{ 1\;\rm mole \;\rm Ca}{ 1\;\rm mole \;\rm CaCO_{3}}\\\\&= 2.5\;\rm moles\end{aligned}[/tex]
Therefore, 2.54 moles of calcium is present.
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