# helpppppppppp

#1
A passenger jet contains 4050 kg of copper wiring. A 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 (1 tonne = 1000 kg).
0
4 years ago
#2
(Original post by toton)
A passenger jet contains 4050 kg of copper wiring. A 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 (1 tonne = 1000 kg).
1) so for every 100g of rock, there are 1.25g of CuFeS2. Calculate the proportion by mass that copper would therefore occupy, for every 100g of rock (= Y%)

then do Y% x 1.25 to find mass of Cu in 100g of rock.

2) How to convert 100g into 1 tonne? Multiply by 10000. So for every 1 tonne rock, there are Y% x 1.25 x 10000g Cu.

3) if there are 4050000 g ( = 4.05 T) of Cu in the jet, and (Y% x 1.25 x 10000) g of Cu per 1T of rock, how many Tonnes of rock will you need?

Spoiler:
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hint: for 1) use periodic table

3
#3
374?

Spoiler:
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hint: for 1) use periodic table

[/QUOTE]
0
4 years ago
#4
(Original post by toton)
374?

Spoiler:
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hint: for 1) use periodic table

[/QUOTE]

How did you arrive at 374?
0
4 years ago
#5
(Original post by toton)
A passenger jet contains 4050 kg of copper wiring. A 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 (1 tonne = 1000 kg).
What a stupid context.

(not having a go at you OP, but just imagine a plane builder being worried about copper extraction from rock)
Last edited by Pigster; 2 years ago
1
#6
Spoiler:
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ok so tell me the answer because
the mr is 247.7
63.5/427.7 *1.25
32.045 grams
so then i got big numbers so i gave up typed up the question and found this

If 1 tonne = 1000 kg, then 4050 kg = 4050/1000 tonnes = 4.05 tonnes
The molar ratio of the composition of the rock is Cu (1): Fe (1): S (2).
However, rock contains only 1.25% of Cu. Therefore the ratio of plane composition to Cu in rock: 100%/1.25% = x80
So to get 4.05 tonnes of Cu from rock, we need 80 x 4.05 tonnes of rock = 374 tonnes

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0
4 years ago
#7
First things first, you calculated the Mr incorrectly.

You followed the method correctly in step 1 - you just used the wrong Mr which led to an incorrect answer 32.045g Cu per 100g rock.
Remember, there is only just 1.25% CuFeS2 (not 32.045%!)

After what you did after that doesn't follow any logical pattern.

I'd appreciate it if you at least attempted the question by following all the steps in the step by step method without giving up in between.
So I'd like it if you re-attempt the question ( hint: the Mr is 185.321 but use your data sheet as the Mr there may be off by small amount depending on accuracy ) then letting me know what you get along with your calculations.
0
4 years ago
#8
(Original post by toton)
i have no clue thanks anyway but i cba to solve it i dont understand wasnt taught it so by you telling me what to do isnt much help unless u show me the answer and expalin the steps to it like i first initially asked
Great attitude and probably the best way to get help ...
0
#9
(Original post by charco)
Great attitude and probably the best way to get help ...

0
4 years ago
#10
(Original post by toton)
noone? is that even a word?
1
#11
Check the sentence again and how about you punctuate properly e,g use a capital letter after a question mark.
0
#12
(Original post by charco)
noone? is that even a word?
Is that Grammar correct? Pretty sure after a question mark you have a capital letter.
0
4 years ago
#13
(Original post by toton)
Pretty sure after a question mark you have a capital letter.
That's not even English!

It's also incorrect to capitalise the word grammar in a sentence.

0
#14
(Original post by charco)
That's not even English!

It's also incorrect to capitalise the word grammar in a sentence.

go away troll
0
#15
(Original post by toton)
go away troll
bored guy
0
#16
(Original post by charco)
That's not even English!

It's also incorrect to capitalise the word grammar in a sentence.

0
4 years ago
#17
(Original post by toton)
bored guy
wtf! Do you realize you just replied to yourself?
0
4 years ago
#18
(Original post by rohit_rocks10)
wtf! Do you realize you just replied to yourself?

Attachment 735728
0
4 years ago
#19
(Original post by dip0)
1) so for every 100g of rock, there are 1.25g of CuFeS2. Calculate the proportion by mass that copper would therefore occupy, for every 100g of rock (= Y%)

then do Y% x 1.25 to find mass of Cu in 100g of rock.

2) How to convert 100g into 1 tonne? Multiply by 10000. So for every 1 tonne rock, there are Y% x 1.25 x 10000g Cu.

3) if there are 4050000 g (= 4.05 T) of Cu in the jet, and (Y% x 1.25 x 10000) g of Cu per 1T of rock, how many Tonnes of rock will you need?

Spoiler:
Show

hint: for 1) use periodic table

Hey, so that's what I did. Please let me know if I am in the correct path(which i doubt tbh)
1. 63.5/183.52 x 1.25 = 0.4325 g = 43.3%
2. 43.3% x 1.25 x 10000 = 5412.5

i don't know i've been trying to do it but i can't seem to get it
0
4 years ago
#20
(Original post by cassywalker)
Hey, so that's what I did. Please let me know if I am in the correct path(which i doubt tbh)
1. 63.5/183.52 x 1.25 = 0.4325 g = 43.3%
2. 43.3% x 1.25 x 10000 = 5412.5

i don't know i've been trying to do it but i can't seem to get it
Yes well done you’re going in the right direction.

Just one more step.
There are 5412.5g per 1T rock,
So how many g of copper will there be in 4.05T of rock?
0
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