Quantitative chemistry Flashcards
What does Mr stand for?
realtive forumla mass
How do you work out the relative forumla mass of a compound?
Add together the relative atomic masses of all the atoms in the molecular forumala added together
Forumla of Percentage mass of an element in a compound
(Ar x number of atoms of that elemtent/Mr of the compound) x 100
What does Ar stand for?
relative atomic mass
What is the avogrado constant?
6.02 x 10^23
Number of moles forumla
mass in g(of an element or compounds)/Mr( of the element or compound)
What is the conservation of mass?
That during a chemical reaction no atoms are destroyed and no atoms are created.Meaning there are the same number and types of atoms on each side which means no mass is lost or gained.
Balance equations using reacting masses
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What is the limiting reactant?
If on reactant gets completely used up in a reaction before the rest, the reaction will stops.That reactant is the limiting reactant.The amount of product formed is directly proportinaly to the amount of limiting reactant..
How to calculate the product depending on the limiting reactant.?
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How much does one mole of any gas occupy?
24dm^3 at 20degrees
At the same temperature and pressure, equal numbesr of moles of any gas will occupy the same volume.
Volume of gas forumla?
volume of gas = (Mass of gas / Mr of gas ) x 24
How to work out volumes of gases in reactions.?
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What is concentration?
the amount of substance in a certain volume of solution
how to work out concentration in g/dm^3 ?
concentration= mass of solute/ volume of solvent
