as level chemistry help: finding mass of ore to be used for a jet

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#1
Report Thread starter 3 years ago
#1
one jet requires 4050 kg of copper
the ore sample that will be used is CuFeS2, where 1.25% of that rock is copper
find the mass of ore, in tonnes, that will be needed for one jet (1000kg=1 tonne)

the mark scheme says to find the moles of copper in CuFeS2 first (which is 63779.52756 moles), multiply that by the Mr of CuFeS2 to find mass of the ore (which is 11703543.31 grams) but i dont understand why in the next step they said to multiply by (100/1.25). could someone explain this to me, thanks.
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