What are some examples of exchange reactions ?

What is the molar mass of potassium nitrate, kno3

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?

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2