When mercury oxide is heated it decomposes into mercury and oxygen. If 28.4g mercury Oxide decomposer 2g of oxygen is produced. What is the percent by mass of mercury in mercury oxide? which law is obeyed?

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this

In france, grapes are 1.95 euros per kilogram. what is the cost of grapes, in dollars per pound, if the exchange rate is 1.14 dollars/euro? (2.6)

How do you know when a chemical reaction has occurred