If 2.0 L of 0.500 M solutions of NH3 is completely used up in a reaction with O2, how many grams of oxygen is needed? Molar mass of O2 is 31.998 g/mol A. 21.3 g
B. 48.0 g
C. 76.0 g
D. 192 g

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?

What is the most stable monatomic ion formed from nitrogen

What metric units would you use to measure the thickness of a key