Ahelium balloon contains 0.48g of helium. given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it contain?

How have the greenhouse gasses increased from the year 2000 to 2018

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.