Question

1 ml of gaseous aliphatic compound CnH3nOm is completely burnt in an excess of O2 and cooled to room temp. The contraction in volume is?
1+1/2n-3/4m
1+1/4n-1/4m
1+3/4n-1/4m
1+3/4n-1/2m​

Answer 1

Answer:1 + 3n/4 - m/2

Explanation:

The gaseous aliphatic organic compound = CnH3nOm

Volume= 1 mL

The balanced reaction for the combustion is,

CxHyOz + (x+y/4-z/2)O2 → xCO2 + y/2H2O

Here, x=n, y=3n, z=m

Hence, the balanced reaction for the combustion of given organic compound will be,

CnH3nOm + (n+3n/4-m/2)O2 → nCO2 + 3n/2 H2O

At RT, the volume of H2O is ognored as it becomes liquid,

Hence, contraction in volume = 1 + n + 3n/4 - m/2 - n = 1+ 3n/4 - m/2

Therefore, the correct answer option is D.

Hope it helps!

Please mark it as brainliest !

Answer 2

Answer:

1 ml of gaseous aliphatic compound CnH3nOm is completely burnt in an excess of O2 and cooled to room temp. The contraction in volume is?

1+1/2n-3/4m

1+1/4n-1/4m

1+3/4n-1/4m

1+3/4n-1/2m