# Help with this question please!

#1
“Passenger jet contains 4050kg of copper wiring. Rock sample contains 1.25% CuFeS2 by mass. Calculate the mass, in tonnes, of rock needed to produce enough copper wire for a passenger jet”

Can someone please direct me to the first step as I am unsure as to how to approach this question.
0
4 years ago
#2
I'm not 100% sure this is the answer, but some of it should at least help.

1. Find out the composition of Cu in CuFeS2. That being the gram formula masses of Cu/(Cu+Fe+2S)

2. Find out what fraction of copper would be in a rock of 1.25% CuFeS2. Well, that's simply our fraction of copper in the compound (step 1) multiplied by 1.25% = (127/367)x0.0125.

3. Lastly, if we require 4050kg of copper then we need to find out how many kg of rock we need. Well, if we know that only (127/367)x0.0125 is copper in a rock of 1kg, then the amount of copper we need is 4050/((127/367)x0.0125) = 936283Kg of rock or simply 936 tonnes.

Hope this helps or maybe someone else can provide a better explanation
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