How does the initial mass of the candle compare with the final mass? Does this violate the Law of Conservation of Mass? Explain your reasoning.

In the reading, yao chen-yuan describes traveling to deliver a message. why was he willing to risk danger to travelto tientsin? he wanted to the boxers with their cause

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?