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C3 (Limiting reaction (reactions stop when a reactant has ran out (for…
C3
Limiting reaction
the amount of product depends on the limiting reactant
reactions stop when a reactant has ran out
for example when magnesium and co2 react there will be a fizz to start but the magnesium will run out meaning it is the limiting react
The mole
a mole is simply how much of is in the amount of a substance
for example one mole has 6.02x10 to the power 23
this number is called the avagandro constant
the formula is mass in g / mr= the number of moles
66g of co2/atomic number of 44=1.5 moles worth
conservation of mass
if mass does change however there will be a gas involved
one explanation for this is a gas is already present in the atmosphere
so when elements react then it could partake in the reaction thus leading to a wait change
in a chemical reaction mass is always conserved
no atoms are gained or destroyed because of this no mass is gained or lost
for example 2li+f2=liF so nothing in terms of mass has changed but they are now bonded
Relative formula mass
compounds have a relative formula mass
to calculate this you just add the relative atomic masses
For example mgcl2 = 95 as
mg=24 and 2xcl=71
71+24=95