Mercury(ii) oxide (hgo) decomposes to form mercury (hg) and oxygen (o2). the balanced chemical equation is shown below.2hgo    2hg + o2the molar mass of hgo is 216.59 g/mol. the molar mass of o2  is 32.00 g/mol. how many moles of hgo are needed to produce 250.0 g of o2?

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state. a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car