[thomas49th]

Hi Im told that a packet has 100 FeS04 tablets. Each tablet contains 0.2g of FeSO4
Fe = 56, O = 16, S = 32

Im asked the question

The 100 iron tablets in the packet contain a total mass of 20g of Iron(II) sulphate
Calculate the mass of iron in 20g of iron(II) sulphate

I presume I'm using the equation No of moles = Mass in g / Mr

so where now? Do I calculate the number of moles by doing 0.2 / 152  = 0.001315....
then do I mass = 0.001315 x 56
 = 0.07368421?

Is that right?
Thx

[Yggdrasil]

In your calculations you've correctly calculated the mass of iron in 0.2g of iron (II) sulfate.  The question asks for the mass of iron in 20g of iron (II) sulfate.

[Donaldson Tan]

Thomas: you can directly determine the mass composition (%) of Fe in the FeSO₄ from the chemical formula alone.

[thomas49th]

aha I find the % of iron in sulphate and then multiply that percentage (as decimal) by 20 giving me 7.36g

Thx

[usherlilly]

  what siler nitrate reacts with hydrocchloric  acid, what trpe of reachtion takes place hellumsjulie@bellsouth.net usherlilly

[thomas49th]

You mean when silver nitrate reacts with HCL

AgCl + HNO3

silver chloride and nitric acid?