carbohydrates are compound containing only carbon, hydrogen and oxygen

1.	carbohydrates are compound containing only carbon, hydrogen and oxygen. when heated in the absence of air, these compounds decompose to form carbon and water. If 310 g of a carbohydrate leave a residue of 124 g of carbon on heating in absence of air, what is the empirical formula of the carbohydrate ?
Answer» ANSWERS; $C_6H_{12}O_6$ The MOLECULAR formula of the carbohydrate is Explanation: Given, Carbon present = 124g Water present after decomposition = Total carbohydrates (in GM) - carbon present after decomposition (in gm) Water present = 310 - 124 Water present = 186 gm Number of moles in carbon(C) = 10.03 Number of moles in water( $H_2O$ ) = 10.03 Now, Taking the ratio of $C: H_2O$ = 1: 1 Molecular formula: 0.0833 moles of the carbohydrate contains 1.00g or one atom of hydrogen. Therefore, One mole of the carbohydrate will contains one mole of hydrogen atoms $\dfrac{1}{12} = 0.0833$ The number of hydrogen atoms in the molecules is 12 The molecular formula will be the 6 times for the EMPIRICAL formula- $CH_2O \times 6 \\\\ C_6H_{12}O_6$ $C_6H_{12}O_6$ Hence, the molecular formula of the carbohydrate is

carbohydrates are compound containing only carbon, hydrogen and oxygen. when heated in the absence of air, these compounds decompose to form carbon and water. If 310 g of a carbohydrate leave a residue of 124 g of carbon on heating in absence of air, what is the empirical formula of the carbohydrate ?

Answer»

$C_6H_{12}O_6$ The MOLECULAR formula of the carbohydrate is

Explanation:

Given, Carbon present = 124g

Water present after decomposition = Total carbohydrates (in GM) - carbon present after decomposition (in gm)

Water present = 310 - 124

Water present = 186 gm

Number of moles in carbon(C) = 10.03

Number of moles in water( $H_2O$ ) = 10.03

Now, Taking the ratio of $C: H_2O$ = 1: 1

Molecular formula: 0.0833 moles of the carbohydrate contains 1.00g or one atom of hydrogen.

Therefore,

One mole of the carbohydrate will contains one mole of hydrogen atoms $\dfrac{1}{12} = 0.0833$

The number of hydrogen atoms in the molecules is 12

The molecular formula will be the 6 times for the EMPIRICAL formula- $CH_2O \times 6 \\\\ C_6H_{12}O_6$

$C_6H_{12}O_6$ Hence, the molecular formula of the carbohydrate is