Question

Energy 4. (3 points) How much heat is released when 150.0 g of copper cool down from 70.1°C to 22.3"C7 Specific hest capacity of copper is 0.385 g"C. 5. (3 points) During combustion of acetylene, CHą, according to the reaction below 1299 kJ are released: C Hz + 5/20, 200, + H2O AH = -1299 kJ How much energy is liberated when 100.0 of acetylene combust? 6.3 points) Given the following equations and AH values, determine the heat of reaction (kJ) at 298 K for the reaction: B-H, +6 Cl, → 2 BCI, + 6 HCI BCI, + 3 H2O → H,BO, + 3 HCI B-H. + 6H2O → 2 H BO, + 6 H 1/2 H2 + 1/2 CI: → HCI AH = -112.5 kJ AH = -493.4 kJ AH = .92.3 kJ

Answer 1

6 a= mCAT = 150.0g x 0.3853/gcx (22.3 - 10.1°C = -2760.5 J 3 moles of C₂ H₂ = 100g = 3.85 mol 26 g mut For 1 mol (2H2 AH = -299 kg AH = 3.85 (-1299) = -5001.2 kJ