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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Question
The amount of heat needed to raise the temperature of 1 g of a substance by 1 °C is the object's ___________
A.Heat of Fusion
B. Heat of Vaporization
C.Specific Heat
D.Enthalpy
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- The boiling point of water at sea level is 100.00°C. calculate the amount of heat needed to vaporize 12.754 g of water at this temperature. heat vaporization equals 540.0 Cal/garrow_forwardMercury has a heat of fusion of 2.29 kJ/mol and a heat of vaporization of 59.11 kJ/mol. What is the energy absorbed or released when 6.5 moles of liquid mercury freezes into a solid? a. -380 kJ/mol b. -15 kJ/mol c. +15 kJ/mol d. +380 kJ/molarrow_forwarda. Calculate the heat required to melt 9.00 g of benzene at its normal melting point. Heat of fusion (benzene) = 9.92 kJ/mol Heat = kJ b. Calculate the heat required to vaporize 9.00 g of benzene at its normal boiling point. Heat of vaporization (benzene) = 30.7 kJ/mol Heat = kJarrow_forward
- Choose the substance with the greatest surface tension. A. C12H26 B. C24H50 C. C9H20 D. C6H14arrow_forwardThe heating curve for a quantity of material A at 1.0 atm pressure is shown below. If the amount of material A is doubled at the same pressure, which of the following will happen? a. Intermolecular forces of attraction between substances will get stronger.b. It will take more heat to melt and evaporate the material.c. The temperature at which the material boils will rise.d. The substance's polarizability will rise.arrow_forwardThe following information is given for ethanol at 1 atm: Boiling point = 78.40°C Melting point =-114.5°C Specific heat gas = 0.3418 cal/g°C Specific heat liquid = 0.5880 cal/g°C Heat of vaporization = 200.0 cal/g Heat of fusion = 26.04 cal/g A 44.00 g sample of liquid ethanol is initially at -58.80°C. How many kcal of energy must be added to the sample to raise its temperature to 94.90°C? Energy added = kcalarrow_forward
- Use the observation in the first column to answer the question in the second column. observation At 1 atm pressure, Substance E boils at 11. °C and Substance F boils at 30. °C. At 37 °C, Substance C has a vapor pressure of 89. torr and Substance D has a vapor pressure of 79. torr. The enthalpy of vaporization of Substance A is smaller than that of Substance B. question Which has a higher vapor pressure? Substance E Substance F Neither, E and F have the same vapor pressure. It's impossible to know without more information. Which has a higher enthalpy of vaporization? Substance C Substance D Neither, C and D have the same enthalpy of vaporization. It's impossible to know without more information. At any temperature where both substances are liquid, which has the higher vapor pressure? Substance A Substance B Neither, A and B have the same vapor pressure. It's impossible to know without more information. X Śarrow_forward20.) You want to raise the temperature of ice at 0 degrees Celsius to steam at 110 degrees O Celsius. The specific heat of water is 4.184 J/Cg. The specific heat of steam is 2.01 J/Cg, and the specific heat of ice is 2.03 J/Cg. Ice has a heat of fusion at 334 J/g and water has a heat of vaporization of 2260 J/g. Find the Q for this raise in temperature.arrow_forwardComparing two liquid substances at the same temperature, the one with stronger intermolecular forces will: A. c. have a lower vapor pressure because more molecules have enough energy to escape the liquid surface B. have a lower vapor pressure because fewer molecules have enough energy to escape the liquid surface C. have a higher vapor pressure because more molecules have enough energy to escape the liquid surface D. have the same vapor pressure as the other one because they have the same temperature and hence the same average kinetic energy. E. have a higher vapor pressure because fewer molecules have enough energy to escape the liquid surfacearrow_forward
- For each pair, indicate which type of spectroscopy would most easily distinguish between the pair and give the single piece of info thatwould be different that supports your choice. Choices are MS, IR, UV, H NMR, C NMR. Please explainarrow_forwardHow much heat is required to vaporize 30 g of water at 100˚C?arrow_forward
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