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?
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:
\(CH_2O_3\)