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Exercício de quimica diego

por diego (deivid) Normal Tuesday, August 26th, 2014


1) Sabendo que 2 kg de eucalipto eleva a temperatura de 50 kg de água em 7 ºC, aproximadamente, qual a quantidade de calor liberada na queima de 5 kg de eucalipto?  (Dados: calor específico da água = 1 cal/g . ºC)

2) Determine a quantidade de calor liberada na combustão total de 3 mol do gás hidrogênio.  (Dados: poder calorífico hidrogênio = 29000 kcal/kg  ///  1 mol h2  )

3) Uma pepita de ouro de massa 1 Kg é aumentada sua temperatura de 21 ºC para 24 ºC, quanta energia, em joules, ele absorveu? (Dados: calor específico do ouro = 0,13 J/g . ºC)

4) Informe se as reações são exotérmicas ou endotérmicas.

A)   2C4H10(g) + 13O2(g) à 8CO2(g) + 10H2O(l)

B)   H2 + Cl2 à 2HCl + energia

C)   C2H5OH(l) + 3O2(g) à 2CO2(g) + 3H2O(l)   ΔH = -1368 KJ/mol

5) Calcule o ΔHº em quilo-joules (KJ) para as seguintes reações. Use os valores do livro.

A)   H2(g) + ½ O2(g) à H2O(l)

6) A combustão da álcool etílico (C2H5OH), produz dióxido de carbono e água, liberando para o ambiente 4000 kj/mol de C2H5OH.

     A) Escreva a equação termoquímica que representa o processo.

     B) Represente o processo com um diagrama de entalpia.

     C) Em que situação esse sistema apresenta maior entalpia: antes ou após a transformação?


     D) Qual seria a variação de entalpia na combustão de 10 L de álcool etílico nas mesmas condições de pressão e temperatura? (Dados: dC2H5OH = 0.8 g/mL). 


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