Some Basic Concepts Of Chemistry

Question

Butyric acid contains only C, H and O, 4.24mg sample of butyric acid is completely burnt. It gives 8.45mg of carbon dioxide and 3.46mg of water. What is the mass percentage of each element in butyric acid?

Solution

To calculate the mass percentage of C.

CO subscript 2 identical to straight C

44 space mg space identical to space 12 space mg

44 space mg space CO subscript 2 space contains space straight C space equals space 12 space mg

therefore space space space space 8.45 space CO subscript 2 space would space contain space straight C space equals space 12 over 44 cross times 8.45 space equals space 2.304 space mg

percent sign space age space of space straight C space equals space fraction numerator 2.304 over denominator 4.24 end fraction cross times 100 space equals space 54.30

Percentage of H.

straight H subscript 2 straight O space identical to space 2 straight H 18 space mg space identical to space 2 space mg

therefore space space space 3.46 space mg space straight H subscript 2 straight O space would space contain space straight H space equals space 2 over 18 cross times 3.46 space equals space 0.38 space mg

percent sign space age space of space straight H space equals space fraction numerator 0.384 over denominator 4.24 end fraction cross times 100 space equals space 9.06 percent sign

Percentage of O.

percent sign space age space of space straight O space equals space 100 space minus left parenthesis percent sign age space of space straight C space plus space percent sign space age space of space straight H right parenthesis space space space space space space space space space space space space space space space space space equals space 100 minus left parenthesis 54.30 plus 9.06 right parenthesis space equals space 36.64

Some More Questions From Some Basic Concepts of Chemistry Chapter

For Daily Free Study Material Join wiredfaculty