First, write the balanced equation, this is simple:
Hence each mole of propane requires
moles of oxygen
Also we need to compute molar masses: for it is
for
it is
and for
it is
Now we can determine what initial substance will react completely: of
is
mole and
of
are
moles.
mole of
requires
moles of
but there are only
so all oxygen will be used.
Finally, moles of oxygen make
moles of
so
moles make
moles of
and they have the mass of
66 g. This is the answer.
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