: A city of 100,000 people uses approximately 1.0 x 1011 kJ of energy per day. Suppose all of that energy comes from the combustion of liquid octane (c8H18) to form gaseous carbon dioxide and water via the reaction below. Equation:  C8H18 (l) + 25/2 O2 (g) > 8 CO2 (g) + 9 H2O (g)

Copper metal can be produced by heating copper(II) oxide and hydrogen gas. Another product of the reaction is water. If the molar enthalpy of reaction (A) is +130.5 kJ/mol, calculate the enthalpy of reaction for producing 2.0 g of copper metal.

A scientist measures the standard enthalpy change for the following reaction to be -737.2 kJ : 2Co(g) + 2 NO(g)2CO2(g) + N2(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CO(g) is kJ/mol.

When 9.42 g of methane (CH4) is burned in a bomb calorimeter (heat capacity = 2.677 × 103 J/°C), the temperature rises from 24.00 to 27.08°C.  Calculate the enthalpy change for the following reaction.  (C= 12.00 amu, H = 1.00 amu)                                                       CH4(g) + 2O2(g)  →  CO2(g) + 2H2O(l) Group of answer choices a. 8.425 kJ b. –14.01 kJ c. –8.425 kJ d. 8245 J e. 14.00 kJ

. The complete combustion reaction of solid benzoic acid, CH₂COOH (s), releases 3224 kJ/mol of energy. Determine the standard enthalpy of formation for benzoic acid.

（1）Consider the reaction: 2A (g) + 3 B (g) → 2 C (g)     ΔHrxn = +254.3 kJ What will be the enthalpy change (in kJ) if 0.471 mol B reacts in excess A?   （2）Consider the reaction: C (s) + O2 (g) → CO2 (g)     ΔHrxn = -393.5 kJ What mass of carbon (in g) must be reacted via this mechanism to release 581.2 kJ of heat?

The chemical equation for photosynthesis is as follows: 6 CO2 + 6 H2O → CoH1206 ( + 6 02 Every year, the mass of carbon dioxide used by this reaction on a small island is 2.85 x 10 kg. What is the annual enthalpy change resulting from photosynthesis on the island? Compound AH° (kJ/mol) -1268 02 CO2 -393.5 HO -285.8 O 303 x 10 k Q 2.54 x 10 k O 254 x 10 k O 153x 10' k 0412x 10 k

[References] The combustion of 0.1586 g benzoic acid increases the temperature of a bomb calorimeter by 2.50°C. Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.) Heat capacity kJ/°C A 0.2113-g sample of vanillin (C8H3 O3) is then burned in the same calorimeter, and the temperature increases by 3.29°C. What is the energy of combustion per gram of vanillin? Energy kJ/g Per mole of vanillin? Energy kJ/mol Submit Answer Try Another Version 3 item attempts remaining