Calculate the molecular masses of the following compounds:

(a) Methanol, $C H_{3} O H$

(b) Ethanol, $C_{2} H_{5} O H$

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Solution

(a) The atomic number of carbon is 6 and atomic mass is 12u. The atomic number of hydrogen is 1 and atomic mass is 1u. The atomic number of oxygen is 8 and atomic mass is 16u.

$C H_{3} O H$

12 + 1 (3) + 16 + 1.

12 + 3 + 16 + 1.

15 + 17.

32u.

(b)

Formula of ethanol is $C_{2} H_{5} O H$

2(C) = 2(12) = 24

5(H) = 5(1) = 5

1(O) =1(16) = 16

1(H) =1(1)= 1

Add these , will get 46g/mol

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Similar questions

C_{2} H_{5} O H

(C_{2} H_{5} O H)

Calculate the difference in the formulae and molecular masses for :

(a) $C H_{3} O H$ and $C_{2} H_{5} O H$

(b) $C_{2} H_{5} O H$ and $C_{3} H_{7} O H$

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