A sample of hydrogen gas at a pressure of 0.843 atm and a temperature of 28.7 °C, occupies a volume of 15.9 liters. If the gas is compressed at constant temperature to a volume of 9.87 liters, the pressure of the gas sample
will be
atm

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?

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

Is it safe to take 450mg of diphenhydramine hydrochloride?