What is the mass of a 10 gram sample of potassium-42 that will remain unchanged after 12.4 hours

What is the molar mass of potassium nitrate, kno3

Which fact represents evidence for the big bang theory?

Mercury turns to vapor at 629.88 k how much heat is lost 175 g of mercury vapor at 650 current condenses to a liquid at 297 ca mercury turns to weber at 629.88 kelvin how much he is lost 175 g of mercury vapor and 650 coming condensers to liquidate 297 kevin