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- Given that H2 (g) + F2(g) 2 HF(g) AHgxn = -546.6 kJ 2 H2(g)+02(g) 2 H2O(1) ΔΗ -571.6 kJ rxn calculate the value of AH for +4 HF(g) 02(g) 2F, (g) +2 H2O() kJ ΔΗΗ www.tinacioSpecies ΔHfo NH3 -80.3 O2 0.0 CH4 -74.9 HCN 135.1 H2O -285.8 Calculate the ΔHo for the reaction: 2 NH3 + 3 O2 + 2 CH4 ⟶ 2 HCN + 6 H2O T = 25o C Express the answer to 1 decimal point.Determine the boiling point of CS2, in °C, from the following data: CS2(g) CS2(l) ΔHf° / (kJ mol–1) 115.3 87.9 S° / (J mol–1 K–1) 237.8 151.0 Answer Options: 258 -14 116 78 43Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on. substance A B с D H :0: H | || | H с C -C-H 174 H H H chemical symbol, chemical formula or Lewis structure H H H | | C I 1 I H H H (II | Ag - Ar - :O: -O-H boiling point (Choose one) (Choose one) ✓ (Choose one) (Choose one) ✓For a reaction X + 2Y → 3Z, if the molar enthalpies for X, Y, and Z are Hmx, Hm,Y, and Hm,z respectively, the enthalpy of the reaction, A,H would be: O A. Hm,z- {Hmx+ Hm O B. Hmx+ Hmy+ Hm,Z O C. Hmx+ 2Hmy+ 3Hm,Z O D. -(Hmx+ 2Hm,y+3Hm,Z) O E. 3Hm,z- {Hmx+2Hm,b. Table 4.1 shows the displayed formulae and boiling points of four hydrocarbons, A, B, C and D. A B с D Table 4.1 displayed formula HHHHHH |||||| H-C-C-C-C-C-C-H H 1 H H H H H HHHH H-C-C-C-C-H I II H HHH HHHH HIC-CIC=C-H 1 H H H H HHHH I H-C-C-C-C-C-C-H |||| HHHH boiling point/°C 69 -0.5 -6.3 63 i. Name the two homologous series to which the hydrocarbons in Table 4.1 belong. and ii. Use the information on Table 4.1 to suggest one way in which the boiling point of a hydrocarbon is affected by its molecular structure. iii. A bottle contains a colourless liquid which is thought to be either hydrocarbon A or D. Describe a chemical test, and its results, which could be used to identify which hydrocarbon is in the bottle. Explain your choice of test.Q1/ Calculate the AH, for 3C,H2 (9) AHc (C,H2) = -1.30 J mol1 AHc (C,H.) = -3.303 J mol1 C,H6 (9) when: (g)18. For the following combustion reaction of benzoic acid (HC¬H5O2; molar mass = 122.1 g/mol) HC;H5O2(s) + 15202(g) --> 7CO2(g) + 3H20(1); DHcomb = -3226 kJ 1.00 g of benzoic acid is combusted in a bomb calorimeter, which contains 1.00 kg of water (specific heat = 4.184 J/g.°C) and the bomb has a heat capacity of 890 J/°C. If the initial temperature of the calorimeter is 25.0°C, what is the final temperature of the calorimeter when the combustion is completed? (A) 51.8°C (B) 31.3°C (C) 30.2°C (D) 27.0°Cconstruct the expression for Kc for the following reaction 3H2(g)+6C(s)=C6H6(g)The table below contains some mean bond energy data: Bond C-C 348 H-H N=N Mean bond energy /kJ mol| 436 944 (i) Balance the equation below for the formation of one mole of ammonia, NH3, from its elements. N2 + H2 NH3 AH = -38 kJmol" (ii)Use the data in the table above to calculate the bond energy of N - H bond in NH3 in the reaction given in (1) above. Comment on why the value obtained is referred to as 'mean bond enthalpy (ii) Use the equation below and data from the table to calculate a value for the C=C bond energy in ethene. Bond H-H C-H C-C 348 Mean bond energy /kJ mol 436 418 нн нн С—С + Н Нэнс- с н AH = -136 kJ mol нн н Ethene EthaneGiven that H₂(g) + F₂ (g) →→→ 2 HF(g) 2 H₂(g) + O₂(g) → 2 H₂O(1) calculate the value of AHin for AHixn AHixn 2F₂(g) + 2 H₂O(1) → 4 HF(g) + O₂(g) = = -546.6 kJ AHixn = = -571.6 kJ kJSEE MORE QUESTIONS