Chem CT 3 Flashcards
How to calculate concentration?
mass / volume
what unit is concentration in?
dm cubed
cm cubed to dm cubed
/ 1000
how to calculate the relative formula mass or molar mass or Mr?
add up all the atomic masses in a compound
what does Av mean
Avagadro’s constant = 6.02 x10 23
how to calculate the percentage yield
actual yield / theoretical yield X 100
how to calculate the atom economy
relative formula mass of USEFUL product / relative formula mass of ALL products X 100
how to calculate mol: md dm-3
concentration x volume / 100
what is the law of conservation of mass?
mass at start of reaction = mass at the end of the reaction
how to calculate the volume of a gas
volume/molar volume
explain what the empirical formula
the simplest number ratio of atoms of an element in a compound
what do you do if the ratio in an empirical formula is 1:1.5
times by 2
What is meant by theoretical yield?
the maximum amount of product when reactants have fully reacted.
Why is the actual yield usually less than the theoretical yield in a reaction?
- reaction my be incomplete
- product/reactant lost
- other reactions may occur
