all Verizon 5:21 PM moodle.elms.edu Answer #3 4. Butane (C,H) is used in lighter

Question

all Verizon 5:21 PM moodle.elms.edu Answer #3 4. Butane (C,H) is used in lighters and combusted with oxygen to produce carbon dioxide and water vapor. If 100 mL of butane is combusted, what volume of oxygen is required and what volumes of water vapor and carbon dioxide are produced? Answer #4: Vcam" Voz Yan co2 5. Potassium chlorate (40.44 grams) is decomposed to produce potassium chloride and oxygen gas at 740 mm-Hg and 25°C. If the oxygen gas is collected over water at 25°C what is the volume of oxygen at standard conditions?

Explanation / Answer

Q4.

for butane combustion, assume same conditions for all, i.e. P and T remains the same

so

we cna compare volumes direclty

volume of gases will depend on stoichioemtric factors

so we need the reaction

C4H10 + O2 = CO2+ H2O

balance

C4H10 + 13/2O2 = 4CO2+ 5H2O

C4H10 + 6.5O2 = 4CO2+ 5H2O

now...

100 mL o fbutane reuiqres 6.5x100 = 650 mL of oxygen

and will produce:

4*100 = 400 mL of CO2

5*100 = 500 mL of H2O

Q5.

mol of KClO3 = mass/MW = 40.44/122.55 = 0.32998

KClO3 = KCl + 3/2O2

mol of O2 --> 3/2*mol o fKClO3 = 3/2*0.32998 = 0.49497 mol of O2

now...

P V= nRT

V= nRT/P

Pgas = Ptotal - Pvapor = 740 -23.8 = 716.2 mm Hg

V = (0.49497)(62.4)(25)/(716.2) = 1.0781 Liters

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