Question

I need help with 8 & 9 please.
- ZOOM + 1. A 20.0-gram piece of aluminum at 0.0°C is dropped into a calorimeter containing some hot water. The temperature of the water drops from 90.0°C to 75.0°C. What is the mass of water in the calorimeter? 2. When 13.0 grams of solid NaOH dissolves in 400.0 grams of water in a coffee-cup calorimeter, the temperature of the water rises from 22.2°C to 30.3°C. What is q? What is AHxn for the reaction NaOH(s) Na (m) + OH (9) ? 3. 2.56 grams of sulfur in buined in a bomb calorimeter with excess oxygen. The calorimeter has a heat capacity of 923/°C and contains 815 grams of water. The temperature of the calorimeter and water increases from 21.25°C to 26.72°C. Calculate AHxxn for $86) + 8 022) - 8 SO2(e). 4. Given 2 NH3(g) + 1/ 02e) + H2O + N2H4) AH.n=-143kJ, how much heat is produced by the formation of 27.4 grams of hydrazine? 5. Use the thermochemical equations below to determine the enthalpy change for the reaction 2 Fe3O4(8) + 1026) + 3 Fe2O3(8) 3 Fe2O36 + 6 Ferr) + 2020 AH = +6166.2kJ 2 Fe3O4 + 6 Feux) + 402) AH - +5585k] 6. Use the equations shown below to determine AHa for H2O CHxL) + 2 H2g) - CH«s) 2 CO2(g) + H2O + CH2(g) + O20) 2002 + 3 H20 - CH + / 0260 + H2 + O2(0) AH..=-311.6kJ AH = +1255.5kJ AH = +1427.5kJ 7. For the equation in #6, calculate AH in using heats of formation from Appendix D in your lab manual. How does this value compare with your value calculated using Hess's Law in #6? 8. Calculate AHⓇ for the following reaction using the heats of formation from Appendix R C2H5OH + 3 028) - 2 CO2(g) + 3 H2O 9. The heat of combustion of fructose, C6H1206, is-2812kJ/mol. If a fresh Fuji apple weighing 150. grams contains 20.0 grams of fructose, how many Calories (kcal) does the fructose contribute to the total caloric content of the apple? (Note: 1.000 cal = 4.1841)

Answer 1

mm

& Catgon(g) + 302(g) 200₂ (9) + 3 H₂ old) BHP (Hol) = -285.83 15 mol Дhe Co, g) = 0 Ato "F(Cozig) - = -393.51 kg/mol 7 Ah (Calison, q) = -235.10 kolmas AM = 2x1-393.5) + 3x(+285.83) – (-235-16) -787 - 857.49+ 235.10 Tono = - 1409.39 kJ Molar mass of CH2 6 -- 180 g (may S 180 moles = 20 = o.lll mole Energy released due to fructose 28 12 x D111 I - 312.44 kg. 12.44 kcal -312.44 4-184 - 74 676 kcal 74.676 kcal