25.2 g of CuSO4 6H20 (mm: 267.72 g/mol) is dissolved in 28.0 mL of water, calculate the molarity.

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

Mr. rose asked his student to draw a quadrilateral with four unequal sides. an example of this kind of quadrilateral

The semi-conductors on the periodic table are classified as