Please help An unknown compound has a percent composition of 52.12% oxygen, 8.75% hydrogen, and the rest carbon. The molar mass is 92.11 g/mol. a) Find the empirical formula b) Find the molecular formula.

Used the balanced equation 2h2+ o2 - -> 2h2o. if you have 7.2 grams of o2 , how many grams of h2o can you produce ?

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

All motion is caused by force? true or false