math (Damon) clearly step by step for me

3.2g of a mixture of kn03 and nan03 was heated to constant weight which was found to be 2.64g. What is the % kn03 in mixture?

Who helps me clearly step by step for me.


Thank you .

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asked by Fai
  1. Ok, I will guess but chemistry is not my field.

    I suppose that we are de- oxidizing this stuff and the difference in mass is O2.

    for each chemical equation:
    x is moles of O2 in one reaction and Y is in the other
    2x KNO3---> 2x KNO2 + x O2
    2y NaNO3 --->2y NaO2+ y O2
    The lost mass of O2 is
    (x+y)(32) = 3.2 - 2.64 = .56 grams of O2 boiled away
    so
    x + y = .0175 grams of O2 boiled away

    The mass of KNO3 = 2x(39+3*16)
    = 174 x gm
    The mass of NaO3 is 2y*(23+3*16)
    = 142 y gm
    so
    142 x + 174 y = 3.2

    so in the end we have these two Na and K equations
    x + y = .0175
    142 x + 174 y = 3.2

    solve for moles of K and Na and then go back and get mass in grams of KNO3 from the moles. that mass *100 /3.2 is your percent KNO3

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    posted by Damon
  2. x + y = .0175 **MOLES** of O2 boiled away

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    posted by Damon

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