Question

Calculate the difference in the molecular formula and molecular masses for ch3oh and c2h5oh ,c2h5oh and c3h7oh ,c3h7oh and c4h9oh

Answer 1

(a) CH30OH +CH2=C2H5OH

(b) C2H5OH+CH2=C3H7OH

(c) C3H7OH+CH2=C4H9OH

Answer 2

Given: Given compounds are $CH_3OH, C_2H_5OH$,$C_3H_7OH, C_2H_5OH$ and $C_3H_7OH, C_4H_9OH$.

To find: We have to find the difference in the molecular formula and molecular masses.

Solution:

The atomic mass of C is 12.

The atomic mass of Oxygen is 16 and the atomic mass of H is 1.

Thus differences in the molecular formula and molecular masses are as follows-

$CH_3OH, C_2H_5OH$

$CH_3OH$ has one carbon atom and a mass of 12+4+16=32.

$C_2H_5OH$ has two carbon atoms and a mass of 12×2+6+16=46.

$C_3H_7OH, C_2H_5OH$

$C_3H_7OH$ has three carbon atoms and a mass of 12×3+8+16=60.

$C_2H_5OH$ has two carbon atoms and a mass of 12×2+6+16=46.

$C_3H_7OH, C_4H_9OH$

$C_3H_7OH$ has three carbon atoms and a mass of 12×3+8+16=60.

$C_4H_9OH$ has three carbon atoms and a mass of 12×4+10+16=74.