How much potassium chloride to make 6L of oxygen gas ?

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1. Calculates the weight of potassium chloride needed to prepare 6.00L of oxygen gas at the temperature of 24.0 C and 0,950 atm.
2. The equation is : KClO3 = KCl + 3/2O2
3. A hint please ?
 
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Find out how many moles of oxygen are in 6L of oxygen gas at 24C and 0.95 atm.
 
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