How many formula units are equal to a 0.25 g sample of Chromium (III) sulfate, Cr2(SO4)3?

Drive down any three characteristic of modern periodic table

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3

The plant food contains nh4)3po4 what tests would you run to verify the presence of the nh4 ion and the po4 ion