Question

What weight of O is produced when 3.00 g of KClO3 (s) is decomposed according to the reaction 2KClO3(s) 2KCl(s)+ 3O2(g)?
A. 0.392g
B. 0.587g
C. 0.783g
D. 1.17g

add a quick explanation, thnx
Balance the equation. You have that.
mols KClO3 = grams/molar mass = ?
Use the coefficients in the balanced equation to convert mols KClO3 to mols O2. That's mols KClO3 x (3 mols O2/2 mols KClO3) = mols KClO3 x 3/2 = ?
Now convert mols O2 to grams. grams = mols x molar mass = ?
What weight of O is produced when 3.00 g of KClO3 (s) is decomposed according to the reaction 2KClO3(s) 2KCl(s)+ 3O2(g)?
A. 0.392g
B. 0.587g
C. 0.783g
D. 1.17g

add a quick explanation, thnx

CHEMISTRY - DrBob222, Thursday, March 26, 2015 at 10:11pm

Balance the equation. You have that.
mols KClO3 = grams/molar mass = ?
Use the coefficients in the balanced equation to convert mols KClO3 to mols O2. That's mols KClO3 x (3 mols O2/2 mols KClO3) = mols KClO3 x 3/2 = ?
Now convert mols O2 to grams. grams = mols x molar mass = ?

D. 1.17g

Thanks

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