Hydrazine (n2h4) is used as a rocket fuel. the combustion products are nitrogen (n2) and water (h2o). use the following information about bond energies to estimate the change in enthalpy associated with the combustion of 1 mol of hydrazine

bond bond energy (kj/mol)

n–n 163

n=n 418

n n 941 < - triple bond

n–h 388

o–o 146

o=o 495

o–h 463

a. −583 kj/mol d. −358 kj/mol b. +2,450 kj/mol e. −1,970 kj/mol c. −1,078 kj/mol

Predict the products butane (c4h10) + oxygen —>

You mix the pks of succinic acid are 4.21 and 5.64. how many gramsa graduate student at sdsu wants to measure the activity of a particular enzyme at ph 4.0. to buffer her reaction, she will use a buffer system based on one of the acids listed below, which acid is most appropriate for the experiment? of monosodium succinate (fw = 140 g/mol) and disodium succinate (fw = 162 g/mol) must be added to 1 l of water to produce a solution with a ph 5.28 and a total solute concentration of 100 mm? (assume the total volume remains 1 liter, answer in grams monosodium succinate, grams disodium succinate, respectively.) volumes of 0.05 m nah2po4 and 0.05 m na2hpo4 (pk's for phosphoric acid are 2.15, 6.82 and 12.38). which of the following best describes the resulting solution?

According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead