Saltpeter is a compound made of potassium(k), nitrogen(n), and oxygen(o). every 100.0g of saltpeter contains 38.67g potassium and 13.86g nitrogen. what is the mass of oxygen contained in 285.0mg of saltpeter? answer needs to be in grams

Why does a red shoe appear red in daylight

Agas occupies 475 cm^3 at 313k. find its volume at 367k. you must show all of your work to receive credit. be sure to identify which of the gas laws you will be using

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.