Question

A compound of carbon, hydrogen, and oxygen is found to contain 40% of carbon, 6.7% of hydrogen
and 53.3% of oxygen. Calculate its empirical formula. If its vapour density is 30, calculate the molecular
formula.

Answer 1

Answer:

Explanation:

Elements   Atomic weights   Percentage     Ratio                no.of moles

carbon          12                    40                 40/12=3.33        3.33/3.33 =1 hydrogen      1                     6.7                6.7/1 =6.7          6.7/3.33 = 2(aprom)

oxygen          16                   53.3              53.3/16=3.33        3.33/3.33=1

empirical formula= C H 2 O

empirical formula weight=12+2+16

                                         = 30

molecular weight = 2×vapour density

                             = 2×30

                             =60

molecular formula = empirical formula × n

n= molecular formula weight/empirical formula weight

n= 60/30

n=2

∴molecular formula= C H 2 O × 2

                                 =C 2 H 4 O 2

hope you understand

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Answer 2

Answer:

see the attachment ✌️❣️