Moles & Calculations- chemistry
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20 Terms
What is one mole?
6.02 × 10²³ particles.
What is Avogadro’s constant?
6.02 × 10²³ mol⁻¹.
What is the equation for moles?
Moles = Mass ÷ Molar Mass
What is molar mass?
The mass of one mole of a substance (g/mol).
What does Mr mean?
Relative molecular mass.
What does Ar mean?
Relative atomic mass.
How do you calculate Mr?
Add together the Ar values of all atoms.
What is the unit of mass?
Grams (g)
What is the unit of moles?
mol
How many moles are in 18 g of water?
1 mole.
What is empirical formula?
Simplest whole-number ratio of atoms.
What is molecular formula?
Actual number of atoms in a molecule.
Why are balanced equations important?
They obey conservation of mass.
What is a coefficient?
The number placed before a formula in an equation.
What is stoichiometry?
Calculating quantities using balanced equations.
What happens to atoms during a chemical reaction?
They are rearranged.
Are atoms created or destroyed in reactions?
No.
Why are moles useful?
They link particles with measurable mass.
How do you calculate mass?
Mass = Moles × Molar Mass.
How do you calculate molar mass?
Molar Mass = Mass ÷ Moles.