Tutorial 11 q - CHEM 1A03 TUTORIAL#11 November 23th-27th...

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CHEM 1A03 TUTORIAL #11 November 23 th -27 th 2009 Problems – Chapter 7 & 19 _____________________________________________________________________ 1. From the course notes, we had an expression for work: gases w P V n RT     From this, and our expressions for enthalpy and internal energy, we can re-write H as: V U q w H U P V   gases H U n RT      Based on this expression, calculate the difference between H and U for the combustion of octane at 298K. 2. Nitric Acid is produced by the Ostwald Process in the gas phase at elevated temperature and pressure, which is an industrially important chemical widely used in the fertilizer industry, as discussed in Chapter 15. Based on the balanced net reaction below, and the given heats of formation, all in kJ/mol, determine whether this overall process is exothermic or endothermic, and estimate the energy change per mole of HNO 3 formed. 12 NH 3 (g) + 21 O 2 (g) 8 HNO 3 + 4 NO(g) + 14 H 2 O(g) H f o NH 3 (g): -45.9; HNO 3 (g): -133.9; H 2 O(g): -241.8; NO(g): +91.3 3. When treating a hypothermia victim, it is important to both raise the body temperature, and dry the body. Calculate the enthalpy change required to for a person to warm their body (mass 70kg) from 34 o C to 37 o C, and dry it, using body heat, by evaporating 500g of water from the skin surface (phase change).
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