Calculating Mass from Chemical Reaction

AI Thread Summary
The discussion focuses on calculating the mass of alum produced from a given amount of aluminum (Al) in a chemical reaction. The user identifies aluminum as the limiting reagent and calculates its moles to be approximately 0.049662 mol. Using the molar ratio from the balanced equation, they determine that the moles of alum produced is the same, leading to a final mass calculation. The molar mass of alum is stated as 474.3 g/mol, resulting in a calculated mass of 23.55 g of alum. The user seeks confirmation on the accuracy of their calculations.
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Homework Statement


what is the mass of alum that can be prepared from 1.340g of Al.

Homework Equations


2Al+2KOH+4H2SO4+22H2O ---> 3H2 + 2KAl(SO4)2 * 12H2O


The Attempt at a Solution


given Al is the limiting reagent. Find the moles of Al using n=m/M

I find Al moles to be 0.049662mol.

Now multiply this by the molar ratio of 2/2 (which is 1) to find the moles of alum produced.

now calculate for the mass, m = nM. The molar mass of alum is 474.3g/mol. I find the mass of alum to be 23.55g.

Am I right?
 
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Looks OK to me.
 

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