Posted by David on Tuesday, January 12, 2010 at 8:13pm.
This is a limiting reagent problem. You know a limiting reagent problem when you see it because it always lists BOTH of the reactants.
1. Write and balance the equation.
2. Convert 25 g Al2O3 and 50 g HCl to moles. moles = grams/molar mass.
3a. Using the coefficients in the balanced equation, convert moles Al2O3 to moles AlCl3.
3b. Using the same procedure, convert moles HCl to moles AlCl3.
3c. You have two answers for the same product. Obviously, one of them is incorrect. The correct value is ALWAYS the smaller one and that is the limiting reagent.
4. Now convert the correct value from 3c to grams. grams = moles x molar mass.
Post your work if you get stuck.
i got the mass of aluminum chloride to be 42.7
I didn't obtain that number. Post your work and I'll try to find the error. Start with the balanced equation
Al2O3 + 6HCl ==> 2AlCl3 + 3H2O
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