Asample of liquefied natural, lng, from alaska has the following molar composition: 3.9% c2h6, 1.1% c3h8, 1.1% co2, and the rest ch4. determine (a) the average molecular weight of the lng mixture. (b) the weight fraction of ch4 in the mixture. (c) the lng is heated to 422 k and 148 kpa, and vaporizes completely. estimate the density of the gas mixture under these conditions.

Suppose a pair of chemical compounds a and b can react in two different ways: a + b -> c reaction 1 gives product c. a + b -> d reaction 2 gives product d. the following facts are known about the two reactions: . reaction 1 is endothermic and reaction 2 is exothermic. if a reaction vessel is charged (filled) with a and b , then at first d is produced faster than c. use these facts to sketch a qualitative reaction energy diagram for both reactions. note: because these sketches are only qualitative, the energies don? t have to be exact. they only have to have the right relationship to each other. for example, if one energy is less than another, that fact should be clear in your sketch.