Essential Chemistry for IGCSE - Chemical Calculations (Section 1 - No. 13)
If the relative formula mass of a compound is 40 and its empirical formula mass is 20, what is the relationship between the molecular and empirical formulas?
Molecular formula and empirical formula are the same.
The molecular formula is twice the empirical formula.
The molecular formula is half the empirical formula.
They are completely unrelated.
Explanation
The molecular formula is twice the empirical formula.
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