Question

LALAAM Heat of combustion I Name Calculate the following using the table provided: Assume complete combustion Methane Table 10.5 Standard Heats of Combustion at 25°C Substance Formula Akimo Hydrogen Hla) -296 Carbon Cisl graphite -394 Carbon monoxide CO(g) CH ) -890 Methanol CH,CH(0) Acetylene CH() Ethanol C,H,OHCO 1200 Propane CH() -2220 Benzene CH CH 0 (5) Octane CH -5471 Sucroso CH20,(s) -5645 -1300 1. Calculate the energy released when 56.7g of His burned. 2. If 3572 kJ of energy were released, calculate the mass of ethanol that was burned? 3. How many kJ are released as 9.05 g of sucrose is burned? 4. If 2.45 mol of a substance burns and 5438 kJ were released what is the substance? 5. Determine the heat released as 42.8 g of acetylene burns. 6. When 89.7 kJ is released, how many grams of methane were released.

Answer 1

litus - when I now of high burnt, -286 kJ/mol of energy is released given that 56.2 g of the gas is burned then how much energy will be released.

2.014 56.7 9 of the gas contains 5607 moles of the = 28.15 moles of the I mole of the gives - 286 kJ/mol of energy : 28-15 miles of the will give - (256 x 28.15 kJ/mo) -- 8050.9 kJ/mol @ Any - I more of Elhand) hen burnt gives -1368 kJ/md of energy :.-2572 kJ will be produced by X-3572 moles of ethand = 2.61 miles of ethand) 2.61 modus of elhand) contains 2.61 (+ 46.0729 of Cafot - 120.24 g of C2 HSCH - 3527 kJ is produced by 120.29 ge of 124587

& Aus - from the table I mole of sucrose (C 2 H 220, 1) gives - 5695 kJ . I mole of ciata contains 342.29 g of Cat2zo1 :. 342.29 qof C124 produced -5695 kJ of energy :. 9.05 9 of cut will produce - 5645x9.05 kJ 342:29 -149.25 kJ of energy 295 kJ (4 Aus - Given that I 2.45 mol of substance produced 5438 kJ : 1 ml of substance will produced 5938 kJ - 2219.645 of energy = 2220 kJ (approx.). so, from the table Imole of propane produced 2220 kJ of energy Thus the substance is propane. Aus'- I mole of Acutyling produced 1300 kJ energy. i mole of Autylene = (26.09)g of Acetyleno. 26004 g of Calla produced 1300 kJ of energy .. 42.8 g of calle will produced 1300 x 42.8 kJ 26009 = 2136 71 kJ of energy

Aus - I mode of clay produced 890 kJ of energy. Imole of city contains 16.04 g of Cha. 16.00 g produced 890 kJ of energy 9, 890 kJ of energy is produced by 16.04g of CHq

:: 89.7 kJ of energy will be produced by 16.09 x 89.7 g of Cita = 1.619 of Cha