Butane c4h10 ( = –125.7), combusts in the presence of oxygen to form co2 (g) (hf = –393.5 kj/mol), and h2o(g) (hf = –241.82) in the reaction:
2c4h10 (g) + 13o2 (g) = 8co2 (g) + 10h2o (g)
what is the enthalpy of combustion, per mole, of butane? (a) -2,657.5 kj/mol(b) -5315.0 kj/mol(c) -509.7 kj/mol(d) -254.8 kj/mol

Gymnast always perform on padded mats. how does the mats protect the gymnast

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н, о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

The number at the end of an isotope’s name is the number.