50% 15
If you start with 30g of a radioactive isotope, how much will be left after 1 half life? +

7.5g

15g

30g

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.

hloride, what is the mass of calcium in

explanation:

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.