How many moles of P are needed to react with 30.1 moles of O2

Which statement is true about the part of the electromagnetic spectrum that human eyes can detect? it contains only the colors of the rainbow and television waves. o it is divided into seven ranges of wavelengths. it contains ultraviolet, visible, and infrared light. it is divided into nine ranges of wavelengths.

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?