Considering the definition of molar mass, the mass of 0.200 moles of Zn(NO₃)₂ is 37.874 grams.
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.
In this case, you know the molar mass of the elements is:
So, the molar mass of the compound Zn(NO₃)₂ is calculated as:
Zn(NO₃)₂= 65.37 g/mole + 2× (14 g/mole + 3× 16 g/mole)
Solving:
Zn(NO₃)₂= 189.37 g/mole
Next, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 189.37 grams, 0.200 moles of the compound contains how much mass?
[tex]mass=\frac{0.200 moles x189.37 grams}{1 mole}[/tex]
mass= 37.874 grams
Finally, the mass of 0.200 moles of Zn(NO₃)₂ is 37.874 grams.
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