((m+n)^2÷ m^2-n^2)+ (m^2+mn÷ n^2-mn)​

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

A1.5l container holds p.50 grams of an unknown gas at a pressure of 0.44 atm and a temperature of 50.c what is the molar mass of the unknown gas