Question

what is the empirical formula of vitamin A ( C=83.85, H=10.56, O=5.58)
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Answer 1

The empirical formula of vitamin A : C₂₀H₃₀O

Further explanation  

The empirical formula is the smallest comparison of atoms of compound =mole ratio of the components

The principle of determining empirical formula

• Determine the mass ratio of the constituent elements of the compound.  
• Determine the mole ratio by dividing the percentage by the atomic mass

mol ratio of C : H : O ⇒

$\tt \dfrac{83.85}{12}\div \dfrac{10.56}{1}\div \dfrac{5.58}{16}\\\\6.9875\div 10.56\div 0.34875\rightarrow divide~by~smallest(0.34875)\\\\20\div 30\div 1$