The true ratio of atoms in a molecule or formula unit is called molecular formula
This is the simplest formula that shows the ratio of the different atoms present in a compound.
This is the formula of a compound which gives the true or actual ratios of the different atoms present in a compound
The molar mass of a compound is defined as the sum total of the molar masses of the different atoms present in the compound.
This gives the proportion of the different atoms present in a compound.
From the above definitions, we can conclude that the correct answer to the question is molecular formula
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