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Isobutylene is a hydrocarbon used in the manufacture of synthetic rubber. When 0.847 g of isobutylene was subjected to combustion analysis, the gain in mass of the CO₂ absorber was 2.657 g and that of the H₂O absorber was 1.089 g. What is the empirical formula of isobutylene?

Respuesta :

Mass of isobutylene = 0.847 g

Mass of CO2 = 2.656 g

Mass of H2O = 1.089 g

1st we have to calculate the mass of C and H as follows,

Mass of C [tex]= 2.657[/tex] × [tex]\frac{12.01}{44.01}[/tex]

                 [tex]= 0.275 g[/tex]

Mole of C atoms = 0.725g/ 12 g mol-1 = 0.06 mol

Mass of H = 1.089 × [tex]\frac{2.016}{18.02}[/tex]

                 =  0.122 gm

Mole of H = 0.122g / 1.008 g mol-1

                = 0.12 mol

If we will combine both then, [tex]C_{0.06}H_{0.12}[/tex]

Now divide Both the values (moles) by 0.06 = [tex]C_{0.06/0.06}H_{0.12/0.06}[/tex]

                                                                           =  [tex]CH_2[/tex]

Thus the empirical formula isobutylene is found to be [tex]CH_2[/tex]

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