What mass of KNO3?

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What mass of KNO3 would have to be decomposed to produe 21.1L of Oxygen measured at STP?

2007-11-30 05:18:18 · 1 answers · asked by youssef a 1 in Science & Mathematics ➔ Physics

1 answers

One mole of ideal gas at STP occupies 22.4 liters at STP, so you have 21.1 / 22.4 moles of oxygen. Now you know the mass of oxygen desired, and therefore the number of oxygen molecules required. Since your source compound is KNO3, you now know that you need 1/3 as many K and N molecules as you have O and you can now find the mass of KNO3 required.

2007-11-30 05:40:27 · answer #1 · answered by jgoulden 7 · 0⤊ 0⤋