Unit about 200 million years ago, earths continents were joined asa single land mass called

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?

Which sample at stp has the same number of atoms as 18 liters of ne at stp