Fourteen moles of water at 40 oC is cooled in a freezer at ‐20 oC until all of it is frozen into ice. The process is under constant pressure of 1 bar. Calculate the ΔH involved in the process. What are the ΔV and the expansion work associated with this process? (3 pt) (‐136.9 kJ, 20.93 x10‐6 m3, ‐2.093 J) R =

H tricky one let me think and get back to u

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.

Ithink that one is (c)

The answer to this qustion is c