Which of the following reactions shows a double replacement reaction for cabr2 reacting with na2s?

cabr2 + 2na2s -> 2nasbr + ca

cabr2 + o2 + na2s -> cao2 + 2nabr + h2s

cabr2 + na2s -> 2nabr + cas

cabr2 + na2s -> 2casbr +2na

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

What is the vapor pressure of a solution with a benzene to octane?