The empirical formula is often the same as the molecular formula but not always.
From the en.wikipedia.org
It is an empirical formula that works well in describing dispersion.
From the en.wikipedia.org
A compound's empirical formula is the simplest integerratio of the chemical elements that constitute it.
From the en.wikipedia.org
For polymeric materials, such as minerals and many metaloxides, the empirical formula is normally given, e.g. NaCl for table salt.
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The crystals have the empirical formula of silicon dioxide, but do not consist of separate silicon dioxide molecules in the manner of solid carbon dioxide.
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This is because in 2002 scientists had synthesised a chemical called poliovirus in a test-tube with the empirical formula C332,652H492,388N98,245O131,196P7, 501S2,340.
From the infowars.com
The empirical formula for benzene was long known, but its highly polyunsaturated structure, with just one hydrogen atom for each carbon atom, was challenging to determine.
From the en.wikipedia.org
The wavelength dependence of a material's refractive index is usually quantified by its Abbe number or its coefficients in an empirical formula such as the Cauchy or Sellmeier equations.
From the en.wikipedia.org
The key remaining empirical ingredient to implement the formula for the optimal tax rate is the elasticity e of top incomes with respect to the net-of-tax rate.