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November 24, 2014

November 24, 2014

Posted by **smartypants** on Saturday, April 21, 2007 at 11:37pm.

A)0.0508

B)0.0762

C)0.0835

D)0.125

what is the anwser and what equation would i use to get the anwser?

Write the balanced equation for the decomposition of KClO3.

2KClO3 ==> 2KCl + 3O2.

2. Use PV = nRT to calculate mols of O2 at the conditions given. Don't forget to change 25 C to K. 273 + C = K.

3. Use the equation to convert mols O2 to mols KCl.

4. Convert mols KCl to grams KCl.

mols KCl x molar mass KCl = g KCl.

Post your work if you get stuck.

PV/RT=n

(1atm X .o25L)/ (0.080257 X 298) =

0.00104558 mol O2

Mol O2 converted to Mol KCl =

0.00104558 mol O2 X 3 mol O2/2 molKCl=

0.001568mol KCl

multiplied by 74.551 = 0.116

im stuck

Mol O2 converted to Mol KCl =

0.00104558 mol O2 X 3 mol O2/2 molKCl=

0.001568mol KCl

multiplied by 74.551 = 0.116

im stuck

OMG you are so right i see what i was doing wrong thank you so much ok i got

0.0528

should i mark the first anwser choice since it is the closet?

Check you arithmetic.

I get 0.001022 x 2/3 x 74.55 = 0.0508 g

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