Quantative Chemistry Flashcards
Revision
How do you calculate the relative formula mass (Mr)?
By adding up the atomic masses of all the atoms in the molecule
What is relative formula mass?
The mass in grams of 1 mole of a substance
In a balanced symbol equation Mr of the reactants =?
Mr of the products
What is Mr?
Relative formula mass
What is the formula for percentage of mass?
mr of element divided by formula mass x 100
How do you work out molar/formula mass
Adding the masses of each atom within the compound
What is a mole?
is the amount of a substance. 6.02x10 to the power of 23
What is relative formula mass
The total atomic mass of elements in a compound
What is the equation for molecular weight(moles)
moles = mass divided by relative formula mass
6 x 10 to the power of 23 is what number?
Avogadro’s number / 1 mole
What is the equation for concentration
concentration = mass divided by volume
In chemistry what unit of measurement is used to measure volume
decimeters (dm) cubed
What is conservation of mass
no atoms can be lost or made in a chemical reaction so the mass of the reactants is equal to the mass of products
