Posted by jill on Tuesday, July 17, 2007 at 4:53pm.
3.0 mol sample of KClO3 was decomposed according to the equation 2KClO3 = 2KCl + 3 O2 How many moles of O2 are formed assuming 100% yield? is it 3 moles?
I don't want to work through the details of this problem completely. Tell me what you don't understand about it.
I don't understand how to set up the equation. I do know that 6022 times 10 to the 23 power is a mole but I don't know how to get the answer when we are using 3 moles
3.0 mol sample of KClO3 was decomposed according to the equation 2KClO3 = 2KCl + 3 O2 How many moles of O2 are formed assuming 100% yield? is it 3 moles?
I think you are making the problem harder than it is.
Write the equation.
2KClO3 ==> 2KCl + 3O2.
So the equation tells us 2 mols KClO3 will produce 3 mols O2. So how much will 1 mol KClO3 produce. Obviously that is mols O2 = 3 mols O2 x (1 mol KClO3/2 mols KClO3) = 1.5 mols O2 OR we produce 1.5 mols O2 for every mol KClO3 decomposed. So decomposing 3 mols will just be 3 times that or 3 x 1.5 = 1.5 mols. To put all of that in equation form,
mols O2 = 3 mols O2 x (3 mols KClO3/2 mols KClO3) = 9/2 = 4.5 mols O2.
If you wish to set up a proportion, just do the following.
2mol KClO3/3 mols O2 = 3 mols KClO3/x mols O2. Solve for x.
2/3 = 3/x
2x = 9
x = 4.5

chem  chuuks, Sunday, July 15, 2012 at 3:50pm
2.85 mol O2
Answer This Question
Related Questions
 chemistry  I just can't do this... Two moles of potassium chloride and three ...
 Chemistry  Given the following equation: 2KClO3> 2KCl+3O2 How many moles...
 Chemistry  2KClO3 > 2KCl + 3O2 What mass of O2 can be made from heating ...
 Chemistry Help!  If 100 grams of KClO3 are heated to form KCl and O2 according ...
 chemistry  If my original sample contained 7.1 grams of potassium chlorate. How...
 Chemistry  Can you show me how to do this? 2KClO3 > 2KCl + 3O2 If 5.0(g) of...
 Chem  An excess of Al and 7.9 mole of Br2 are reacted according to the equation...
 science  Use this reaction to answer the question: 2KClO3 > 2KCl + 3O2 If I...
 science  Use this reaction to answer the question: 2KClO3 > 2KCl + 3O2. If ...
 CHEMISTRY  What weight of O is produced when 3.00 g of KClO3 (s) is decomposed ...
More Related Questions