This number--called a mole--is a basic measuring unit in chemistry. Mole Day typically falls during National Chemistry Week. Students develop a new method of counting objects, called the PCU, and ...

What are the units of molarity? The units of molarity are M or mol/L. A 1 M solution is said to be “one molar”. Two solutions that have the same molarity will have the same number of molecules of the ...

1 mol is the amount of substance that contains the same number of particles as there are atoms in 12.0 g of carbon-12.

The angstrom is an extremely small unit, roughly the size of an atom. It is commonly used in fields such as nanotechnology, crystallography, and spectroscopy to measure atomic and molecular structures ...

Calculate the amount of sodium hydroxide, NaOH, in 25.0 cm 3 of solution of concentration 0.1 mol/dm 3. If the amount in mol of a solute in a given volume of solution is known, its mass can also ...