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Why would the mass increase in a reaction?
A gas is being added to a reaction
Why would the mass decrease in a reaction?
It may happen in a non-enclosed system as a gas is produced and the gas escapes into the surroundings
What is the general equation for thermal decomposition?
Metal carbonate → metal oxide + carbon dioxide
How can you calculate the relative formula mass?
How can you calculate the percentage by mass of an element in a compound?
How can you calculate the atom economy?
MUST TAKE INTO ACCOUNT THE COEFFICIENT WHEN CALCULATING Mr OR Ar IN ATOM ECONOMY
How do you calculate moles?
Mass should always be in grams
How can you calculate the number of particles using avogadros constant?
Number of particles= mole × Avogadro’s constant
How can you calculate the mass of a single atom using Avogadro’s constant?
Mass of a single atom in g = Relative atomic mass / (6.02 × 10^23)
How can we use moles in order to balance equations?
• Calculate the mole of each substance using the given mass
• Divide each mole by the smallest mole
Here is an example
What is the general method for reacting mass equations?
How can we work out the percentage yeild?
How can we identify the limiting reactant?
General method:
• Calculate the moles of the reactants
• Use the molar ratio to identify the reactant in excess and limiting
How can we calculate the concentration of the solutions?
What is the general method for calculating the concentration of a substance? (Titration calculations)
How can you find the number of moles of a gas ?
How can we calculate the uncertainty?
