# Chemistry

2KClO3----->KCl2 +3O2
the equation is balanced

How many grams of O2 will be formed from 3.76 grams of KClO3?

How many grams of KClO3 are needed to make 30.0 grams of KCl?

How many grams of KCl will be formed from 2.73 grams of KClO3?

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1. It is NOT balanced
2 K on left, 1 K on right
maybe
2 KClO3----->2 KCl +3 O2
?
get that right first, then find grams per mol for everything

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2. 2KClO3----->2KCl +3O2
I meant to have the equation like this

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3. 2KClO3----->KCl2 +3O2
the equation is balanced
No, wrong equation. You NEVER, NEVER, NEVER, NEVER, EVER, balance an equation by changing the subscripts. You ALWAYS change the coefficient.
2KClO3 ==> 2KCl + 3O2

How many grams of O2 will be formed from 3.76 grams of KClO3?
mols KClO3 = grams/molar mass = 3.76/122.5 = approx 0.03. Convert mols KClO3 to mols O2 this way.
0.3 mols KClO3 x (3 mols O2/2 mols KClO3) = approx 0.3 x 3/2 = 0.45.
grams O2 = mols O2 x molar mass O2 = ?

How many grams of KClO3 are needed to make 30.0 grams of KCl?
Use the same process to calculate grams KClO3 to make 30.0 g KCl.
Post or work if you get stuck.
Use the same process to do the last part also.

How many grams of KCl will be formed from 2.73 grams of KClO3?

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DrBob222

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