Considering the definition of molar mass, 0.1834 moles of ZnCl₂ would be in 25 g.
Definition of molar mass
The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.
Molar mass of ZnCl₂
In this case, you know the molar mass of the elements is:
- Zn= 65.37 g/mole
- Cl= 35.45 g/mole
So, the molar mass of the compound ZnCl₂ is calculated as:
ZnCl₂= 65.37 g/mole + 2× 35.45 g/mole
Solving:
ZnCl₂= 136.27 g/mole
Moles of 25 grams ZnCl₂
Next, you can apply the following rule of three: If by definition of molar mass 136.27 grams of the content are contained in 1 mole, 25 grams of the compound are contained in how many moles?
[tex]amount of moles=\frac{25 gramsx1 mole}{136.27 grams}[/tex]
amount of moles= 0.1834 moles
Finally, 0.1834 moles of ZnCl₂ would be in 25 g.
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