you are a food specialist in a company that specializes in refrigerated delicacies, and one of your brands requires being maintained at a temperature of 5°C. You determine average water activity (aw) at this temperature to be 0.2. One day, you are informed that the cooling systems on one of the delivery trucks carrying your company’s products malfunctioned while en route to its destination and it would not be fixed until the next delivery. The driver has informed you that the temperature in the delivery bay of the truck is averaging 55°C. You estimate a heat of sorption (Q) of 19 kJ/mol. Calculate the water activity of the brand at this elevated temperature and comment on it’s integrity. Should the delivery still push through? Or should the products be recalled and disposed

A) CO2(g)+OH−(aq)→ Express your answer as a chemical equation. Identify all of the phases in your answer.     B)NaHCO3(s)+H+(aq)→ Express your answer as a chemical equation. Identify all of the phases in your answer.   C)CaO(s)+C(s)Δ→ Although heat is required for this reaction, do not include the symbol ΔΔ in your answer. Express your answer as a chemical equation. Identify all of the phases in your answer.

A student dissolves 12.6 g of ammonium nitrate (NH4NO3) in 200. g of water in a well-insulated open cup. He then observes the temperature of the water fall from 22.0 °C to 17.9 °C over the course of 8.1 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NH4NO₂ (s) NH(aq) + NO3(aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 2 significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy ΔΗ per mole of NH4NO3. rxn exothermic…

19. An ice cube is placed in a sealed insulated container of hot water at 80°C. After five minutes, the ice cube disappears. Ice Cube Hot Water Water 5 min. Which best describes the change that took place inside the container? Heat energy in the ice cube was dissipated into the hot water. Heat energy in the hot water was reduced by kinetic energy in the ice cube. The total heat energy in the container was reduced by the ice cube. O The hot water lost the same amount of heat energy as the ice cube gained.

When 3.02 g of NH4Cl  is dissolved in enough water to make 20.05 mL of solution, the temperature dropped from 19.8°C to 9.1°C.  Calculate the enthalpy change (in kJ) when 1 mole of NH4Cl is dissolved in water.  The density and specific heat of water are 1.00 g/mL and 4.18 J/g°C respectively.

Given the following information, calculate the heat of solution for the salt in the unit of kJ. A calorimeter contains 44.96 g of water. The temperatures of the calorimeter and water are both 22.6 degrees Celsius. 2.42 g of salt is dissolved in the water. Then, the temperature falls to (2.1x10^1) degrees Celsius. (Note: the heat capacity of this calorimeter is 30.1 J/degree Celsius. Pay attention to the sig. figs. in your calculation.)

A student dissolves 13.0 g of ammonium nitrate (NH4NO3) in 300. g of water in a well-insulated open cup. She then observes the temperature of the water fall from 21.0 °C to 16.5 °C over the course of 3.3 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NH4NO₂ (s) NH(aq) + NO3(aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy ΔΗ. per mole of…

1. A student determines the molar mass of acetone, CH,COH., by the method used in this experiment. She found that the equilibrium temperature of a mixture of ice and water was 0.5°C on her thermometer. When she added 10.5 g if her sample to the mixture, the temperature, fell to -2.6°C. She then poured off the solution through a screen into a beaker. The mass of the solution was 86.4g. d. How much water was in the decanted solution?

Identify the correctly written "formation reaction" among the following reactions. Hint: Recall the definition of a "formation reaction". O 2H2 (g) + 02 (g)→ 2H20 (1) N2 (g) + O2 (g) → 2NO (g) O 2H2 (g) + 02 (g)→ 2H20 (g) 2C (s. graphite) + 2H2(g) → C2H4 (g) H20 () + 1/2 02 (g) → H202 (1)

A student dissolves 11.9 g of ammonium nitrate (NH4NO3) in 200. g of water in a well-insulated open cup. He then observes the temperature of the water fall from 22.0 °C to 16.5 °C over the course of 7.6 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NH4NO3 (s) NH(aq) + NO3 (aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 2 significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy ΔΗ, per mole of NH4NO3. rxn 0…