rrrogers Posts: 3, Reputation: 1 New Member #1 Oct 8, 2010, 09:41 PM
How many moles of H2 are produced if you have 6.22 moles of HCL
How many moles of H2 are produced if you have 6.22 moles of HCL
 rrrogers Posts: 3, Reputation: 1 New Member #2 Oct 8, 2010, 09:43 PM

How many grams of Fe can be produced from 1.75 grams of Fe2O3
 Unknown008 Posts: 8,076, Reputation: 723 Uber Member #3 Oct 9, 2010, 06:13 AM

Having HCl alone won't give you any moles of hydrogen gas... =/ Are you reacting the acid with a metal? Or hydrolysing the acid?

But if you are doing any of those, you should think like this:

1 mole of HCl contains 1 mole of H atoms.
In 1 mole of H2, there are 2 moles of H atoms.

This means that 2 moles of HCl will give 1 mole of H2.

Can you find the number of moles of H2 now that you can get from 6.22 mol of HCl?

Same thing goes for the next problem.

1 mole of Fe2O3 contains 2 moles of Fe.

What is the mass of 1 mole of Fe2O3?

It is given by: $\frac{Mass}{M_r} = Moles$

Find the Mr of Fe2O3 to get the number of moles of Fe2O3 that 1.75 g of Fe2O3 contains.

Then, use proportions to get the number of moles of Fe.

When you got that, use the formula I gave you to find the mass of this amount of moles of Fe.

Post what you get! :)

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