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6. Calculate the energy in the form of heat (in k.J) required to convert 100.0 grams of liquid water at 80.0°C to steam at 122 °C. Assume that no energy in the form of heat is transferred to the environment. (Heat of fusion 333 J/g; heat of vaporization 2256 J/g; specific heat capacities: liquid water 4.184 J/g K, steam 1.92 J/g K) (a) 238 kJ (b) 226 kJ (c) 4.22 kJ (d) 8.37 kJ (e) 17.6 kJ 7. The thermochemical equation for the combustion of butane is shown below. 13 C4H40(g) + 02(g).-→ 4C02(g) + 5H20(1); Δ,H。=-2877 kJ/mol-rxn What is the enthalpy change for the following reaction? 8 co, (g) + 10H20 (g)--12 C4H,o(g) + 13 02(g) (a) +1439 kJ/mol-rx (b) +2877 kJ/mol-rxn (c)-5754 kJ/mol-rxn
7. The thermochemical equation for the combustion of butane is shown below. 13 C,Ho(g) + 02(g)-→4CO2(g) + 5H20(1): Δ,Ho=-2877 kJ/mol-rxn What is the enthalpy change for the following reaction? 8co,(g) + 10H20(g)-→ 2C4Ho(g) + 1302(g) 1 (a) +1439 kJ/mol-rxn (b) +2877 kJ/mol-pxn (c) /-5754 k.J/mol-rxn (d) 2877 kJ/mol-pm (e) /+5754 kJ/mol-rxn 8. Iron oxide reacts with aluminum in an exothermic reaction. Fe20s(8) +2 AI(s)2 Fe(s) +Al2Os(s) The reaction of 5.00 g FeOs with excess Al(s) evolves 26.6 kJ of energy in the form of heat. Calculate the enthalpy change per mole of Fe2Os reacted.
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, @woter (lnud) (80%丿 nata r (Iquid)→54eam(r) 1,10%) 一う steam ー 122 heat ure ma we s speeAhe heat 8364丁 - m Lv 22S6 J o j «AT,ペ丁 1-92丁 : 4224丁 8368T t 2256 сот + 4224丁

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