Carbon, hydrogen and ethane each burn exothermically in an excess of air. 1. c(s)+o2(b) co2(g) ah-393.7 kl mol h2(g) +o2(g) h20(i) ah-285.9 kj mol chalg)+302(b)2co2(g) + 2h 20 ( ) ah-1411.0 kj mol use the data to calculate the standard enthalpy change of formation, ah, in kj mol, of ethene at 298 k. 2c(s)+2h2(b) cahalb) 2. manganese metal can be obtained by the reaction of manganese dioxide with aluminium. 4al(s)+3mno2(s)2 al, os(s)+3 mn(s) calculate the enthalpy change of reaction. given: 2al(s)+3/2 02(g) al2os(s) ah-1680 kj mol. mn(s)+o2(g) mno2 (s) ah -520 kj mol1

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?

Why are pipes bursting in the in extremely cold weather?

Enzymes affect the reactions in living cells by changing the