Argon-39 has a half-life of 269 years. how long will it take for 52.5 g of a 60.0 g sample to decay to its daughter isotope?

If a solution had a ph of 7 what is the solution

Identify the lewis acid in this balanced equation: ag+ + 2nh3 -> ag(nh3)2+a. ag+b. nh3c. ag(nh3)2+

The following transition occurs at a molecular level for a substance. what transition corresponds to this change in microscopic structure? the carbon dioxide molecules on the left are in a regular, tightly packed pattern. after heating, it becomes much lower density. a. melting b. boiling c. sublimation d. freezing