HONR 1206 Study Guide - Final Guide: Helium Atom, Containment Building, Hydrogen Production

• School: Northeastern University
• Department: Honors Program
• Course: HONR 1206
• Professor: Kirss Rein

Document Summary

Charcoal c + o2 co2, h = 33. 8 kj/g. Natural gas (methane) ch4 +o2 co2 + 2h2o, h = 50. 2 kj/g. Propane c3h8 + 5o2 3co2 + 4h2o, h = 46. 5 kj/g: the energy to heat water is derived from breaking the bonds of hydrocarbons. C-c bond: 346kj/mol (4(c-h) + 2(o=o)) (2(c=o)+4(o-h)) (4(413kj/mol)+2(495kj/mol)) - (2(799kj/mol) + 4(463kj/mol)) = 808kj/mol. Propane (8(c-h)+2(c-c)+5(o=o)) (6(c=o)+8(o-h)) (8(413kj/mol)+2(346kj/mol)+5(495kj/mol)) (6(799kj/mol)+8(463kj/mol)) = 2023kj/mol. Hf : the enthalpy change of the formation of one mole of a substance from its elements. Enthalpy change can be calculated using values of hf . How much propane and methane do we need to heat 250g of water from 10 c to 100 c? q = mc t = 250g(4. 184j/g c)(90 c) = 94140j = 94. 14kj. Calculate the fuel values of methane and octane. C + 2h2 ch4; h = -74. 8kj/mol. 8c + 9h2 c8h18; h = -249. 9kj/mol. C + o2 co2; h = -393. 5kj/mol. H2 + o2 h2o; h = -241. 8kj/mol.