Understanding Mole Concept in Chemistry
What is a mole and how is it related to mass?
A mole is the unit used to measure the amount of a substance. It represents the number of elementary entities (atoms, molecules, ions) present in a substance, which is defined as Avogadro's number (6.022×10²³). Molar mass, measured in grams per mole, is the mass of one mole of a compound. How is mole related to mass?
Answer:
One mole of any substance contains Avogadro's number of elementary entities. The mass of one mole of a substance in grams is equal to its molar mass in Daltons. This relationship allows us to convert between mass and moles using the formula number of moles = mass / molar mass.
To calculate the mass of a certain number of moles of a substance, you can use the formula: mass = number of moles x molar mass.
For example, if we have 5.2 moles of Ca(NO3)2 and want to find its mass, we can multiply the number of moles by the molar mass of Ca(NO3)2 (164.08 g/mol). Therefore, mass = 5.2 moles x 164.08 g/mol = 853.216 g.
This calculation shows that the mass of 5.2 moles of calcium nitrate is 853.216 grams, illustrating the relationship between moles and mass in chemistry.