4.3 Quantitive Chemistry
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What is the law of conservation of mass?
That no atoms are lost or made during a chemical reaction so the mass of the products equals the mass of the reactants
What is the relative atomic mass?
The sum of the relative atomic masses of the atoms in the numbers shown in the formula
What is the avagadros constant?
6.02x10to the power of 23
What does the avagadros constant mean?
The number of atoms molecules or ions in a mole of any substance
What is a mole?
The amount of substance in the relative atomic or formula mass of a substance in grams
What is the formula to find mass?
Mass = number of moles x formula mass
How can change in mass be explained?
A reactant or product is a gas and its mass has not been taken into account
What is the symbol for the unit mole?
Mol
What is one mole of a substance in grams numerically equal to?
It’s relative formula mass
What is a limiting reactant?
The reactant that is completely used up
Why is the limiting reactant called the limiting reactant?
Because it limits the amount of products
How can the concentration of a solution be measured?
In mass per given volume of solution
What is percentage yield?
The actual mass of a product collected in a reaction divided by the maximum mass that could have been formed in theory multiplied by 1p0
What is the formula for percentage yield?
Mass of product produced/maximum mass of product possible x 100%
What is the relative formula mass of a compound?
Sum of the relative atomic masses of the atoms in the numbers shown in the formula
What is the equation for atom economy?
Relative formula mass of desired product from equation/sum of relative formula masses of all reactants x100