The energy values of carbohydrates, fats, and proteins are 4 kcal/g, 9 kcal/g, and 4 kcal/g, respectively. If the recommended kilocalorie is 2000 kcal per day for someone trying to maintain their weight, will they be able to achieve this with the following daily diet?

Breakfast: 1 large egg (has 6 g of fat and 6 g of protein) and 1 baked potato (has 23 g of carbohydrate and 3 g of protein)

Lunch: 1 medium banana (has 26 g of carbohydrate and 1 g of protein), 1 cup of nonfat milk (has 12 g of carbohydrate and 9 g of protein), 3 oz ground beef (has 14 g of fat and 22 g of protein), and 3 oz broccoli (has 4 g of carbohydrate and 3 g of protein)

Dinner: 3 oz salmon (has 5 g of fat and 16 g protein) and 1 cup of carrots (has 11 g of carbohydrate and 2 g of protein)

One gram of propane (density = 0.493 g/mL) provides 12.0 kcal of energy. A propane clothes dryer requires 19000 kJ/h of energy to operate. How many hours can the dryer operate with 19.5 gallons of propane?

The energy in food is reported in Calories where 1 Calorie = 1 kcal. A certain flavored granola bar contains 415 Calories. Calculate the energy in calories and in joules.

Which of the following represent q and w for a system that is doing work on the surroundings and losing heat to surroundings?

a) q > 0, w > 0

b) q > 0, w < 0

c) q = 0, w > 0

d) q < 0, w = 0

e) q < 0, w < 0

f) q < 0, w > 0

Identify the exothermic reaction(s).

a) AgCl (s) → Ag⁺ (aq) + Cl^– (aq); ΔH = 127 kJ/mol

b) 2 Mg (s) + O₂ (g) → 2 MgO (s); ΔH = –1203 kJ/mol

c) Na₂SO₄ • 10 H₂O (s) → Na₂SO₄ (aq) + 10 H₂O (l); ΔH = 74 kJ/mol

d) 2 Al (s)+ Fe₂O₃(s) ⟶ 2 Fe (s) + Al₂O₃ (s); ΔH = −852 kJ/mol

e) 2 Fe₂O₃ (s) + 3 C (s) → 4 Fe (s) + 3 CO₂ (g); ΔH = 468 kJ/mol

f) CaO (s) + H₂O (l) → Ca(OH)₂ (s); ΔH = −65.2 kJ/mol

Which among the processes below is expected to be endothermic?

When mothballs (naphthalene), C₁₀H₈(s), sublime to the gas phase to form C₁₀H₈(g), how does heat interact with the surroundings, and is the process endothermic or exothermic?

The acetobacter bacteria can convert ethanol (C₂H₅OH) into acetic acid (CH₃COOH) via an aerobic process. The overall reaction is:

C₂H₅OH(l) + O₂(g) → CH₃COOH(l) + H₂O(l)

Calculate the ΔH for the reaction and use the bond dissociation energy in the table below even if the species are not in gaseous form. Report your answer in kcal/mol and kJ/mol. [C₂H₅OH: has five C–H bonds, one C–C bond, one C–O bond, and one O–H bond; CH₃COOH: has three C–H bonds, one C–C bond, one C=O bond, one C–O bond, and one O–H bond)

For the neutralization of NaOH and HCl: NaOH(aq) + HCl(aq) → H₂O(l) + NaCl(aq)  ΔH = –57.9 kJ/mol

In a coffee cup calorimeter, 50 mL of 0.712 M NaOH was neutralized with 50 mL of 0.712 M HCl. If both solutions were initially at 25 °C, determine the final temperature of the solution. Assume that the density and heat capacity of the solution is the same as that of water.

Lead ions can be precipitated using a solution of bromide ions: Pb²⁺(aq) + 2 Cl^–(aq) → PbCl₂(s)     ΔH°_f = –336.0 kJ/mol

Calculate ΔH for the formation of 5.15 g PbCl₂.

Calculate the mass of water required to evaporate from the skin to release 2.15 × 10⁵ J of heat from the body given the following data:

H₂O(l) → H₂O(g);      ΔH_vap = 40.7 kJ/mol