How does a clamp and stand reduce risk in laboratory

Why are people not able to skip a dive to the deepest part of the ocean

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?

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %