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Additional info for Schaum's Outline of College Chemistry: 1,340 Solved Problems + 23 Videos (Schaum's Outlines)
7. forty. Ca(OH), (s) the warmth developed on combustion of one g of starch, (C6H1005)x,into CO2 (g) and H20 ( I ) is 17. forty eight kJ. Compute the traditional enthalpy of formation of one g of starch. Ans. 7. 39. --f 282 kcal= 1 a hundred and eighty kJ the warmth liberated on whole combustion of one mol of CH4 fuel to CO2 (g) and H20 ( I ) is 890 kJ. confirm the enthalpy of formation of one mol of CH4 fuel. Ans. 7. 38. [CHAP. 7 THERMOCHEMISTRY -909. three kJ/mol the warmth of answer of CuS04. 5H20 in a large number of water is five. four kJ/mol (endothennic). Calculate the warmth of response for CUSO4. 5H2O (S) CUSO4 (S) f 5H2O ( I ) Use facts from challenge 7. 39. -+ Ans. seventy eight. five kJ (exothermic) = 18. eight kcal 7. forty-one. the warmth advanced on combustion into CO2 (g) and H20 ( I ) of one mol C2H6 (g) is 1559. eight kJ, and for combustion of one mol C2H4 ( g ) is 1410. eight kJ. Calculate A H of the next response: C2H4 ( g ) + H2 ( g ) ---$ C2H6 Ans. 7. forty two. (8)- -136. eight kJ the answer of CaC12 6H20 in a wide quantity of water is endothermic to the level of 14. 6 kJ/mol. For the response CaC12 (s) + 6 H 2 zero ( I ) -+ CaC12 . 6 H 2 zero (s) A H = -97. zero kJ. what's the warmth of resolution of CaC12 (anhydrous) in a wide quantity of water? Ans. eighty two. four kJ/mol (exothermic) 7. forty three. Hydrolysis is a vital natural response during which a wide natural molecule makes use of a water molecule to separate into smaller molecules. because the similar quantity and type of chemical bonds are found in either reactants and items, one may well anticipate just a small strength switch. Calculate A H " for the gasoline section hydrolysis of dimethyl ether in response to desk 7-1 and the extra warmth of formation values: CH30CH3 (g), -185. four kJ/mol; CH30H (g), -201. 2 kJ/mol. The response is: CH30CH3 ( g ) + H20 (d ---$ 2CH30H ( g ) A H " = +24. eight kJ the economic creation of water fuel makes use of the response C (s) + H20 (g) H2 (g) + CO (8). the mandatory warmth for this endothermic response could be provided by way of including a constrained quantity of oxygen and burning a few carbon to carbon dioxide. what number grams of carbon needs to be burned to CO2 to supply sufficient warmth for the water gasoline conversion of a hundred g of carbon? forget all warmth losses to the surroundings. Ans. 7. forty four. -+ Ans. 33. four g CHAP. seventy one 7. forty five. THERMOCHEMISTRY one hundred and five The reversible response Na2S04 10H20-+ Na2S04+ 10H20 A H = +18. eight kcal a is going thoroughly to the proper at temperatures above 32. 4"C, and continues to be thoroughly at the left less than this temperature. the program has been utilized in a few sunlight homes for heating at evening with the power absorbed from the sun's radiation in the course of the day. what percentage cubic toes of gas gasoline should be kept in keeping with evening through the reversal of the dehydration of a set cost of a hundred lb Na2S04 lOH20? suppose that the gasoline worth of the fuel is 2000 Btu/ft3. + Ans. five. three ft3 7. forty six. an enormous criterion for the desirability of gas reactions for rockets is the gasoline price in kilojoules, both in keeping with gram of reactant, or in line with cubic centimeter of reactant. Compute either one of those amounts for every of the next reactions: (4 N2H4 ( I ) + 2H202 (0 N2 (8)+ 4H20 ( g ) + + + (b) 2LiBH4 (s) + KC104 (s) -+ Li20 (s) B203 (s) KCl (s) 4H2 ( g ) (c) 6LiAlH4 (s) 2C(N02)4 ( I ) 3A1203 (s) 3Li20 (s) 2CO2 (g) 4N2 (g) ( d ) 4HN03 ( I ) + 5N2H4 ( I ) 7N2 ( g )4- 12H20 ( g ) (e) 7N204 ( I ) + C9H20 ( I ) nine c o 2 ( g ) + 10H20 ( g ) + 7N2 ( g ) (f 4ClF3 (I)+(CH3)2N2H2 (I) 2CF4 ( g ) + N2 (8)+4HC1 ( g )+4HF ( g ) + + + -+ + + + 12H2 ( g ) + Use the subsequent density values: N2H4 (I), 1.