Name: ________________________________________ 15 Pts.
How much heat is evolved when 355 grams of sulfur is burned in excess oxygen?
Recall Calorimetry? Q=Cp.m.DT, CpH2O = 4.18J/g.ºC
B2H6(g) + 3O2(g) à B2O3(s) + 3 H2O(g) DH= – 2035 kJ
a.) Calculate the heat released when 1.0 gram of diborane is burned?
b.) What amount of heat is generated when 500. liters of O2 is reacted at STP?
c.) How much heat is released when a mixture of 30.0 g of B2H6 and 30.0 g of O2 is reacted?
Ignition of H2 gas: 2H2 + O2 à 2 H2O DH= – 572 kJ
Combustion of CH4 (methane): CH4 + 2O2 à CO2 + 2H2O DH= – 891 kJ
a.) Which source of energy gives more energy per gram? (Show calculations for both amounts in kJ/g)
b.) Find the amount of energy that is released when 25.0 liters of methane reacts with 60.0 liters of oxygen at STP.
What amount of heat energy is released when 3.31 grams of iron(III) oxide reacts with 1.18 grams of carbon monoxide?