A researcher studying the nutritional value of a new candy places a 5.80 g sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.25 °C. If the heat capacity of the calorimeter is 46.90 kJ-K-, how many nutritional Calories are there per gram of the candy? Calories per gram of candy: Cal/g

A researcher studying the nutritional value of a new candy places a 5.80 g sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.25 °C. If the heat capacity of the calorimeter is 46.90 kJ-K-, how many nutritional Calories are there per gram of the candy? Calories per gram of candy: Cal/g

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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In order to determine the heat capacity of their latest phone, CrabappleTM engineers cool the phone in the freezer to -31.8ºC. They then drop it into a calorimeter with some water in it that is at a temperature of 57.4ºC. The calorimeter (including the water) has a total heat capacity of 780.92 J/ºC. After a few minutes the temperature of the calorimeter is stabilized to 35.8ºC. What is the heat capacity of the phone? Enter your answer with at least 3 sig figs assuming units of J/ºC.
The heat of combustion (AH) for an unknown hydrocarbon is -8.21 kJ/mol. If 0.344 mol of the hydrocarbon is burned in a bomb calorimeter, what is the change in temperature (°C) of the calorimeter? The heat capacity of the bomb calorimeter is 1.12 kJ/°C.
100.0 mL of cold water at 20.5 oC was poured into a styrofoam coffee cup calorimeter. After adding 100.0 mL of hot water at 30.5 oC and mixing it thoroughly, the temperature of the mixture was found to 24.7 oC. Find the heat capacity of the calorimeter. [Specific heat capacity of water is 4.184 J/goC. Assume density of water is 1.0 g/mL at both temperatures.]
9. A researcher sets out to calibrate a solution calorimeter. The researcher first adds a 75.000 mL sample of water to the calorimeter, measuring a temperature of 22.4°C after the water and calorimeter reach thermal equilibrium. The re- searcher then heats a separate 75.00 mL sample of water to 40.1°C and adds this sample to the previous one in the calorimeter. After the water has mixed and a new thermal equilibrium with the calorimeter is reached, a temperature of 27.0°C is measured. What is the heat capacity of the calorimeter?
A researcher studying the nutritional value of a new candy places a 4.90 g sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.61 °C. If the heat capacity of the calorimeter is 48.50 kJ-K-, how many nutritional Calories are there per gram of the candy?
12. When 30.0 mL of 1.00 M HCl(aq) and 45.0 mL of 1.00 M NaOH(aq), both at 21.0 °C, are added to a coffee cup calorimeter, the temperature of the mixture reaches a maximum of 24.0° What is the amount of heat produced by this reaction? The mixture has a specific heat of 4.184 J/g °C and density of 1g/mL. Show work and write your answers in 4 significant figures. Box in your final answer. HCl(aq) + NaOH(aq) --> NaCl(aq) + H₂O(1)
When 1.836 grams of sucrose (Molar mass 342.3 g/mol) is burned in a bomb calorimeter, the temperature of the calorimeter increases from 22.41°C to 26.63°C. If the heat capacity of the calorimeter is 4.900 kJ/°C, what is the heat of combustion of sucrose?
A researcher studying the nutritional value of a new candy places a 5.60 g sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.41 °C. If the heat capacity of the calorimeter is 47.50 kJ.K-, how many nutritional Calories are there per gram of the candy? Calories per gram of candy: Cal/g
You place 75.0 mL of 0.25 M NaOH in a coffee-cup calorimeter at 25.0oC and add 25.0 mL of 0.25 M HCl, also at 25.0oC. After stirring, you found that the heat, q of the reaction is -924.67 J. Calculate the change in enthalpy of the reaction (in kJ/mol of the H2O formed).
We place a metal rod weighing 5.00 g with a specific heat capacity of 0.320 J/K/g in 20.4 mL of water. The specific heat capacity of water is 4.184 J/K/g and we make the approximation that its density is exactly 1.000 g/mL. The water has an initial temperature of 20.0 oC and the metal rod has an initial temperature of 88.0 oC. What is the final temperature (in oC) of the water and metal rod?
When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. Thermometer Cardboard or In the laboratory a general chemistry student finds that when 3.38 g of CuCl,(s) are Styrofoam lid dissolved in 114.10 g of water, the temperature of the solution increases from 25.37 to 27.99 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.60 J/°C. Nested Styrofoam cups Based on the student's observation, calculate the enthalpy of dissolution of CuCl2(s) in kJ/mol. - Reaction occurs in Assume the specific heat of the solution is equal to the specific heat of water. solution. AHdissolution kJ/mol kc Cengage Ln
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