Question

The heat evolved in the combustion of glucose is -680kcal the weight of co2 produced when 170kcal of heat is evolved in the combustion of glucose

Answer 1

Answer:

11 grams.

Explanation:

44g----680

Xg------170

x=44×170/680

x=11

Answer 2

The weight of$CO_2$ produced when 170 kcal of heat is evolved in the combustion of glucose is 66 grams

Explanation:

Heat of combustion is the heat produced when 1 mole of the substance is completely oxidized. The production of heat means the reaction is an exothermic process and gives off energy.

$C_6H_{12}O_6+O_2\rightarrow 6CO_2+6H_2O$  $\Delta H=-680kcal$

Moles of carbon dioxide produced when 1 mole of glucose undergoes combustion= 6

When 680 kcal of heat is produced, = 6 moles of carbon dioxide are produced

Thus when 170 kcal of heat is produced =$\frac{6}{680}\times 170=1.5$ moles of carbon dioxide are produced

Mass of carbon dioxide produced =$moles\times {\text {Molar mass}}=1.5mol\times 44g/mol=66g$

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