Chemistry question (GCSE)

Hi, im stuck on a chemistry question. I desperately need help.

I'm having some trouble with this question:

"Iron is the most commonly used metal. Iron is extracted in a blast furnace from iron oxide using carbon monoxide.

Fe2O3 + 3CO ---> 2Fe + 3CO2

a) A sample of the ore haematite containes 70% Iron Oxide. Caluclate the amount of iron oxide in 2000 tonnes of haematite.

70/100 X 2000 = 1400 tonnes of iron.

part b is where I'm having problems:

b) Calculate the amount of iron that can be extratced from 2000 tonnes of haematite.
(RAM, 0=16, Fe=56)

If anyone has any idea on how to do this, can you give a thorough explanation please?

Reply 1

flatcaps

The molecular formula of a compound describes the ratio of atoms of different elements. You can use this to work out the % iron by mass.

Fe2O3

To put mass into the picture, multiply the RAM of the elements by the no. of elements.

'Mass' of Iron = 2 * 56
'Mass' of Oxygen = 3 *16

The % of the mass Iron is going to be:

2*56 / (2*56 + 3 *16) then * 100
= 70 %

And then apply this to the mass you have, 2000 tonnes
70/100 * 2000 = 1400tonnes

Reply 2

jamal1425

OP

flatcaps

The molecular formula of a compound describes the ratio of atoms of different elements. You can use this to work out the % iron by mass.

Fe2O3

To put mass into the picture, multiply the RAM of the elements by the no. of elements.

'Mass' of Iron = 2 * 56
'Mass' of Oxygen = 3 *16

The % of the mass Iron is going to be:

2*56 / (2*56 + 3 *16) then * 100
= 70 %

And then apply this to the mass you have, 2000 tonnes
70/100 * 2000 = 1400tonnes

But 1400 tonnes is the amount of iron oxide form the ore haematite.#

Reply 3

jamal1425

OP

Got it! that 1400 tonnes is the key thing here.
You were right about the rAM of iron and thne dividing it by the ram of the toal, i think this is it:

RAM , Fe203 = 160

112 (Fe2) + 48 (O3) = 160

sp 112/160 * 1400 = 980 tonnes!!!

Thanks flatcaps!!

Chemistry question (GCSE)

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