Question

CHEM 2A Class Pack F18 Ideal Gas Law and Reactions 15. What volume of oxygen is collected when 5.25g of potassium chlorate is reacted at 725torr and 32°C? 2KCIO3 (s) → 2 KCI (s) + 3 O2 (g) b) what volume of oxygen will be collected when 5.25g of potassiur chlorate react at 0°C and 1 atm? 16.25.2L of sulfur dioxide gas was collected over water at 25°C and How many grams of Iron (II) sulfide were reacted? (6) + 4 SO2(g)

Answer 1

2KClO3(s) -----------> 2KCl(s) + 3O2(g)

2moles of KClO3 to gives 3 moles of O2

2*122.5g of KClO3 to gives 3moles of O2

5.25g of KClO3 to gives = 3*5.25/(2*122.5)   = 0.0643 moles of O2

n = 0.0643moles

T   = 32+273   = 305K

P   = 725/760    = 0.954atm

PV = nRT

V   = nRT/P

      = 0.0643*0.0821*305/0.954   = 1.687L of O2 >>>>answer

2KClO3(s) -----------> 2KCl(s) + 3O2(g)

2moles of KClO3 to gives 3 moles of O2

2*122.5g of KClO3 to gives 3moles of O2

5.25g of KClO3 to gives = 3*5.25/(2*122.5)   = 0.0643 moles of O2

n = 0.0643moles

T   = 0+273   = 273K

P   = 1atm

PV = nRT

V   = nRT/P

      = 0.0643*0.0821*273/1 = 1.44L of O2 >>>>answer