1-How many moles of oxygen are formed when 23.5 g of KNO 3 decomposes according to the following reaction?

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1-How many moles of oxygen are formed when 23.5 g of KNO3 decomposes according to the following reaction?  The molar mass of KNO3 is 101.11 g/mol.

4 KNO3(s)  →  2 K2O(s) + 2 N2(g)  + 5 O2(g)

2-Determine the density of CO2 gas at STP.

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