Question

Which of the following has a AH-0kJ/mol? A) NO(g) C) Fe (aq) D) H20( E) N (R) 23. Find the standard enthalpy of formation of ethy lene, Call4(g), given the following data: beat of combustion of CaH(g)--1411 J/mol, AHCO )-393.3 Jmol AH TH OD)]-285.8 kJ/mol. A) 52 kJ/mo B) 87 kJ/mol C) 731 kJ/mol D) 1.41 x 103 kUmol E) 2.77 x 10 kJ/mol 24. During volcanic eruptions, hydrogen sulfide gas is given off and oxidized by air according to the following chemical equation: 2H2S(g)+302(g)- 2S02(g)+2H0g) Calculate the standard enthalpy change for the above reaction given: AH-146.9 kJmol H- -2964 kJ/mol A) -1036.I kJ/mol B) -742.3 kJ/mol C)-149.5 kJ/mol D) 443.3 kJ/mol E) 742.3 kJ/mol 25. The combustion of butane produces heat according to the equation 2C,Hiolg)+1302(8) 8co (8)+10H00) Hl -5,314 kJ/mol How many grams of CO, are produced per 1.00x 10* kJ of heat released? A) 23.4g B) 44.0 g C) 82.3 g D) 187 g E) 662 g Page 6
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Answer 1

P_1 v_1/t_1 = p_2 v_2/t_2 P_2 = p_1 v_1 T_2/t_1 v_2 = (750)(480)(41) /(25)(600) p_2 = 988 mm Hg p_1 = 750 MM Hg v_1 = 480 cm^3 t_1 = 25 p_2 = 25 p_2 = ? v_2 = 600t_2 = 41 pv = nrt PV = W/ M WT rt MWT = wrt/pv mwt = wrt6/pv 760 mm H g = 1 atm M = (7)(0.0821)(302)/(1)(6.20) . g times d k/atm times k = 27.99 = 28 g/mole v_1/n_1 = v_2/n_2 methane moles = w/ mwt n_1 = 0.75 v_1 = ? v_1 = /0.74 = 7.16/0.341 v_1 = 7.16 times 0.75/0.431 = 15.7 L n_2 = 15/44 = 0.341 v_1 = 7. 16 v =