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What is the empirical formula of a compound composed of 3.25% hydrogen (H), 19.36% carbon (C), and 77.39% oxygen (O) by mass?

Verified Answer :

CH2O3

C=19.36\12    =  1.61
H=3.25\1.008 =3.22
O=77.39\16=4.83

then dived the moles with the smallest mole 

C=1.61\1.61=1
H=3.22\1.61=2
O=4.83\1.61=3

E.F
CH2O3

Answer:

\(CH_2O_3\)

Explanation:

Taking a calculation basis of 100 grams, you have:

\(m_{H}=3.25 g\)

\(m_{C}=19.36 g\)

\(m_{O}=77.39 g\)

Dividing by their atomic weights:

\(n_{H}=\frac{3.25 g}{1g}=3.25\)

\(n_{C}=\frac{19.36 g}{12g}=1.61\)

\(n_{O}=\fracc{77.39 g}{16g}=4.83\)

Dividing by the smallest:

\(n_{H}=\frac{3.25}{1.61}=2\)

\(n_{C}=\frac{1.61}{1.61}=1\)

\(n_{O}=\fracc{4.83}{1.61}=3\)

The empirical formula will be:

\(CH_2O_3\)