In a coffee-cup calorimeter, 1.60 g of NH4NO3 was mixed with 75.0 g of water at an initial temperature of 25.008C. After dissolution of the salt, the final temperature of the calorimeter contents was 23.348C. a. Assuming the solution has a heat capacity of 4.18 J 8C21 g21, and assuming no heat loss to the calorimeter, calculate the enthalpy of solution (DHsoln) for the dissolution of NH4NO3 in units of kJ/mol. b. If the enthalpy of hydration for NH4NO3 is 2630. kJ/mol, calculate the lattice energy of NH4NO3.
Line-Angle Formulas o The “ends” of lines and the breaks/intersections/bends imply carbons. o Hydrogen atoms on carbons are assumed. o butane (C H 4:10 The bottom left end of this structure is assumed to be CH 3 the top left bend is assumed to be CH ,2the bottom right bend is assumed to be CH , a2d the top right end is assumed to be CH 3 o pentane (5 carbons): o hexane (6 carbons): o heptane (7 carbons): o octane (8 carbons): o nonane (9 carbons): o decane (10 carbons): Constitutional Isomers o example #1: C H 6 14 All of these have the same formula, but they have different structures (constitutional isomers). Hexane is normal and unbranched, whereas the other ones
