# Chemistry 101

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Iron reacts with hydrochloric acid to produce iron (2) chloride and hydrogen gas.Fe (s)+ 2 HCL (aq) -FeCl2 (aq) + H2 (g).The hydrogen gas from the reaction 2.2g of iron with excess acid is collected in a 10L flask at 25 degrees celcius. What is the pressure of the hydrogen gas in the flask?

• Chemistry 101 -

First off, I don't know what iron(2) chloride is. I assume you meant iron(II) chloride.
1. You have the balanced equation.
2. Convert 2.2 g Fe to moles. #moles = g/molar mass.
3. Using the coefficients in the balanced equation, convert moles Fe to moles H2.
4. Now use PV=nRT to calculate P.

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