Considering the definition of molar mass, the mass of 4.02 mol Ba(NO₂)₂ is 921.9468 grams.
Molar mass is the mass of one mole of a substance, which can be an element or a compound.
Therefore, knowing the molar mass, the mass can be calculated using the expression:
mass= moles× molar mass
In the periodic table, you can find the molar mass of the elements, also called atomic mass or atomic weight.
To calculate the molecular mass of a compound, also called mass or molecular weight, you must add the molar mass of the elements of the compound multiplied by the number of atoms of each element that make up the compound.
In this case, being the atomic mass:
- Ba: 137.34 g/mole
- N: 14 g/mole
- O: 16 g/mole
The molecular mass of Ba(NO₂)₂ can be calculated as:
Ba(NO₂)₂= 137.34 g/mole× 2× (14 g/mole +2×16 g/mole)
Ba(NO₂)₂= 229.34 g/mole
Then, the mass of 4.02 mol Ba(NO₂)₂ can be calculated as:
mass= 4.02 moles× 229.34 g/mole
mass= 921.9468 grams
Finally, the mass of 4.02 mol Ba(NO₂)₂ is 921.9468 grams.
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