The molecular weight of Mn2Se7 = 662.1grams /mol
Molecular weight of a molecule:
The molecular weight of molecule is calculated using the periodic table to find out the atomic weight of each atom times the number of atoms present.
Therefore, atomic weight of Mn= 54.9 × 2 = 109.8g
Se = 78.9 × 7 = 552.3g
109.8g + 552.3g = 662.1g/ mol
Therefore the molecular weight = 662.1grams /mol
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