Explain why a mole is a special number?

Which of the dna typing techniques do you think you would choose if you had to analyze a dna sample? why?

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.