Chapter 10: Mass and Moles

One mole

One mole

________ of any substance is just an amount of that substance that contains an Avogadro number of particles- so 6.02 x 10, 23, particles.

chemical reaction

During a(n) ________ no atoms are destroyed and no atoms are created.

particles

The ________ could be atoms, molecules, ions or electrons.

calculate % mass of an element in a compound

Ar x number of atoms of that element / Mr of the compound x 100

You can use moles to

_________calculate masses in reactions

Conservation of mass rule

no atoms are destroyed or created

Calculate relative atomic mass

To calculate the relative atomic mass of chlorine, the average mass of one atom of chlorine is found by considering 100 atoms of chlorine.

Relative atomic mass

The relative atomic mass of an element is defined as the weight in grams of the number of atoms of the element contained

Avogadro constant

6.02 x 10(23)

Mole

amount of a substance that contains an Avogadro amount of particles

Carbon dioxide mole amount

44

Nitrogen gas mole amount

28

Carbon mole amount

12

Calculate number of moles

mass in g(of an element or compound) / Mr(of the element or compound)

Explanation 2 for if mass changes

Mass decreases, one of the products is a gas and all reactants are solid, liquid or aqueous

Explanation 1 for if mass changes

mass increase, one of reactants is a gas that's found in air

Compounds have a

_________relative formula mass