Question

1kg of sodium per oxide will produce what quantity of oxygen in STP

Answer 1

287.2L

Explanation:

Given parameters:

Mass of sodium peroxide = 1000g = 1kg

Unknown

volume of oxygen produced at STP

Solution:

At standard temperatue and pressure STP;

     Number of moles = $\frac{mass }{molar mass}$

molar mass of Na₂O₂ = (2 x 23) + (2 x 16 ) = 78g/mol

   Number of moles = $\frac{1000}{78}$ = 12.82mole

To solve this problem, we need to write the equation of the reaction since this is a decomposition reaction;

     Na₂O₂  →  2Na  +  O₂

The unknown is the volume of oxygen that would be produced at STP

  Volume of gas at STP = number of moles x 22.4

From the equation;

   1 mole of   Na₂O₂ produced 1 mole of  O₂ gas

  12.82mole will produce 12.82mole of oxygen gas

   

Now, the volume of gas at STP = 12.82 x 22.4 = 287.2L

learn more:

Volume of gas at STP brainly.com/question/12684384

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