6. A student makes measurements from which she calculates the enthalpy of neutralization as 58.5357 kJ mol¹. She estimates that her result is precise to ± 2%. Which of the following gives her result expressed to the appropriate number of significant figures? a. 58 kJ mol¹ b. 58.5 kJ mol₁ C. 58.54 kJ mol¹ d. 58.536 kJ mol¹

6. A student makes measurements from which she calculates the enthalpy of neutralization as 58.5357 kJ mol¹. She estimates that her result is precise to ± 2%. Which of the following gives her result expressed to the appropriate number of significant figures? a. 58 kJ mol¹ b. 58.5 kJ mol₁ C. 58.54 kJ mol¹ d. 58.536 kJ mol¹

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...

See similar textbooks

Similar questions

2 NO(g) N2(g) + O2(g) H = -180.7 kJ 2 NO(g) + O2(g) 2 NO2(g) H = -113.1 kJ 2 N2O(g) 2 N2(g) + O2(g) H = -163.2 kJ Use Hess's law to calculate H for the reaction below.3 NO(g) N2O(g) + NO2(g)H = _____k J
the laboratory a student finds that it takes 101 Joules to increase the temperature of 13.6 grams of solid iodine from 20.6 to 39.3 degrees Celsius. e specific heat of iodine calculated from her data is J/g°C.
Consider these reactions, where M represents a generic metal. 2 M(s) + 6HCl(aq) →→→ 2 MC1₂(aq) + 3H₂(g) HCI(g) HCl(aq) H₂(g) + Cl₂(g) → 2 HCI(g) MCI, (s) → MCI, (aq) Use the given information to determine the enthalpy of the reaction 2 M(s) + 3 Cl₂(g) → 2 MC1₂ (s) 1. 2. 3. 4. ΔΗ = AH₁ = -694.0 kJ AH₂ = -74.8 kJ AH3= -1845.0 kJ AH4 = -375.0 kJ kJ
10. Ethanol OH weighing 3.56 g is burned in a calorimeter. The temperature rises from 15.C to C. The temperature rises from 15.1 If to 28. heat of the bomb plus water is 8.224C. Find the Δ in kJ/mol. (provide the given and required to find in the problem) (Kindly provide a CLEAR and COMPLETE solution) (Answer should be typewritten)
A 0.2415 g sample of solid magnesium is burned in a constant-volume bomb calorimeter that has a heat capacity of 3024 The temperature increases by 1.978 °C. Part 1 of 2 kJ Calculate the heat associated with the burning of Mg in Be sure your answer has the correct number of significant digits. g Part 2 of 2 kJ g ☐ x10 ☑ Calculate the heat associated with the burning of Mg in kJ mol Be sure your answer has the correct number of significant digits. KJ mol x10 ☑
N.28.
IT The temperature of a sample of aluminum increased by 24.6 °C when 255 J of heat was applied. Substance Specific heat J/(g lead 0.128 What is the mass of the sample? silver 0.235 copper 0.385 iron 0.449 aluminum 0.903 m =
P
A chemist carefully measures the amount of heat needed to raise the temperature of a 1.65kg sample of C9H10O2 from 25.9°C to 37.9°C. The experiment shows that 3.09 X 104J of heat are needed. What can the chemist report for the molar heat capacity of C9H10O2? Round your answer to 3 significant digits. = J * mol-1 * K-1
Express the quantity in the unit indicated and designate whether this heat is gained or lost by the substance a. The quantity of heat in calories when 162.5 grams of water undergoes a temperature decrease from 45.84 C to 40.00 C. b. The quantity of heat in Kilojoules when 43.5 Kg of chloroform ,CHCl3 has its temperature changed from 16.8 C to 22.3 C ( sp ht of CHCl3 = 0.971 KJ/kg- C)
An unknown sample of coal is burned in an apparatus with a calorimeter constant of 0.73 kj/°c. When a 0.26-g sample is used, the temperature change is 10.5°C. What is the energy density of the sample in k/g? Round your answer to 2 decimal places.
A chemist carefully measures the amount of heat needed to raise the temperature of a 0.57 kg sample of a pure substance from 18.0 °C to 35.9 °C. The experiment shows that 19. kJ of heat are needed. What can the chemist report for the specific heat capacity of the substance? Round your answer to 2 significant digits. - 1 - 1 •K J. g x10