Suppose we knew that there were 8.170 x 1023 atoms of O in an unknown sample of KMnO4. How many grams would the unknown sample weigh in? Answer in standard notation.

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?

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.