Answer :
The molecular mass of the sodium dichromate will be 262 g/mol and the formula for the sodium dichromate will be [tex]Na_{2} Cr_{2} O_{7} .[/tex]
The molecular formula of a molecule identifies the types of atoms it contains along with the quantity of each type. If an atom of a particular kind exists in a single atom, no subscript would be used. If an atom has two or more of a specific kind of atom, a subscript is given to its symbol.
Calculation of the molecular mass as:
Molar mass of sodium = 23 g/mol
Molar mass of chromium = 52 g/mol
Molar mass of oxygen = 16 g/mol
So, the molecular mass of the sodium dichromate will be (2 × 23) + (2 × 52) + (7× 16) = 262 g/mol.
Therefore, the molecular mass of the sodium dichromate will be 262 g/mol.
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