A mixture of CH4 and C2H6 (both are gases) has a total pressure of 0.53 atm. Just enough O2 is added to the mixture to bring about complete combustion of each reactant to gaseous products. The total pressure of the product gases is 2.2 atm. Assuming constant volume and temperature, find the mole fraction of CH4 in the mixture.

For which one of the following reactions is the value of δh° rxn equal to δh° f for the product? a. 2 h2 (g) + o2 (g) → 2 h2o (l) b. n2 (g) + o2 (g) → 2 no (g) c. 2 h2 (g) + o2 (g) → 2 h2o (g) d. h2o (l) + 1/2 o2 (g) → h2o2 (l) e. none of the above

Drug abuse will not lead to physical and psychological dependence. true or false ?

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.