Question

will you please help me with 7 and 8?

18 15 = 7. A 0.1036 g sample of solid magnesium is burned in a constant-volume bomb calorimeter that has a heat capacity of 3024 J/ °C. The calorimeter contains exactly 200 g of water, and the temperature increases by 0.913 °C. Calculate the heat given off by the burning Mg in kJ/mol. BOX OOD FS 1620 8. Calculate the heat of combustion for the following reaction from the standard enthalpies of formation listed in Table 9.4, Tro p. 394: b mo wowo 2C2H2(g) +502) 4CO2(g) + 2H206 odo mowo song of motor nobl wed nontoo lolo Sasta mala LOVE

Answer 1

0.1036 g solid my amg + Ora ngo Heat capacity of Calorimeter = 3024 Iloc AT = 0.913 ° c q =heal gain by Calorimeter & Heal gain by the а е с т т т SAT = 3024 x0.913 +200X4,184 x0.913 = (3024 + 200 X 40184) 0.913 = 3524.91J moles in 0.1036 of ng = 0.1036 24 heat given off by one mole - 35249 1x24 0.1036 = 816581.46 /mol - 816,58 kJ/mol

2 GH₂ (9) + 50 (9) - 4 Co (9) +250ld) Alison SH comb - z knip - ZONGOR = 48H ( + 2 DH f (0) - [2 of Cant SBM66) z ation co₂ = -393,5 kg/mol hole) = -285.8 kilomet SH₂ (9) = 227 kJ/mol DH = 47-393.5 + 28-285, 8 - (2x227 +5X0] = -1574-571-6 - 454 3-2599,6 I = -2.59 kJ