What is the theoretical oxygen demand in liters of air for a 50 mg/l solution of acetone at stp?

Where can i find naap lab answers sheet/key?

This drawing shows a human body system. what is the primary function of this body system?

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?