Anyone know this answer for my chemistry quiz?

What are four significant sources of ghgs that come from wostem washington?

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.