04 Chemical Reactions of Alcohol की रासायनिक अभिक्रियाऐं || Chap 11 | 12th , IIT JEE, NEET

Heat of reaction is defined as the amount of heat absorbed or evolved at a given temperaturewhen the reactants have combined to form the products is represented by a balanced chemcial equation. If the heat is denofed by q then the numerical value of q depends on the manner in which the reaction is performed for the two methods of conducting chemical reactions in calorimeters. Constant volume W = 0 and q_(v) = Delta E Bomb calorimeter Constant pressure W = - V Delta P, therefore q_(P) = Delta E + P Delta V rar (V. Delta P) When maltose C_(12)H_(22)O_(11)(s) burns in a calorimetric bomb at 298 K yielding carbon dioxide and water, the heat of combustion is -1350 kcal/mol, the heat of combustion of maltose at constant pressure will be

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Sachin Tendulkar has a certain average for 11 innings. In the 12th innings he scores 120 runs and thereby increases his average by 5 runs. His new average is- सचिन तेंदुलकर की 11 पारियों का एक निश्चित औसत है। उसने अपने 12वां पारी में 120 रन बनाकर अपने औसत में 5 रन की वृद्धि कर दी है तदनुसार, उसका नया औसत कितना हे?

Relating the different ways of expressing reaction rates: Ethanol (CH_(3)CH_(2)OH) , the avtive ingredient in alcoholic beverges and an octane booster in gasoline, is yielded by fermentation of glucose. The balance chemical equation is C_(6)H_(12)O_(6)(aq.)overset("zymase")rarr 2CH_(3)CH_(2)OH(aq.)+2CO_(2)(g) How is the rate of formation of ethanol related to the rate of consumption of glucose ? Strategy : The rate of disappearance of a reactant X is -Delta[X]//Delta t while the rate of appearance of a product Y is Delta[Y]//Delta t . We can express the rate of the reaction in terms of either rate expressoin. To find the relative rates, look at the coefficients in the balanced chemical equation. These rate expressions can be equated , if we first divide each by the coefficient of the corresponding substance in the chemical equation.

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