Consider the following data for aluminum:26.982molatomic masselectronegativity1.61kJ42.5molelectron affinitykJ577.5molionization energykJ10.7molheat of fusionYou may find additional useful data in the ALEKS Data tab.Does the following reaction absorb or release energy?releaseabsorb(1) Al(g)- Al (g) + eCan't be decided with the data given.yesIs it possible to calculate the amount of energy absorbedor released by reaction (1) using only the data above?noO O If you answered yes to the previous question, enter theamount of energy absorbed or released by reaction (1):||kJ/molDoes the following reaction absorb or release energy?releaseabsorb(2) Al (g)Al(g) + eCan't be decided with the data given.yesIs it possible to calculate the amount of energy absorbedor released by reaction (2) using only the data above?noIfyou answered yes to the previous question, enter theamount of energy absorbed or released by reaction (2):|kJ/mol

Two questions based on periodic properties, which is to be accomplished.

Consider the following data for aluminum: atomic mass 26.982 mol electronegativity 1.61 kJ 42.5 mol electron affinity kJ 577.5 mol ionization energy kJ 10.7 mol heat of fusion You may find additional useful data in the ALEKS Data tab. Does the following reaction absorb or release energy? release absorb (1) Al(g) - Al (g) + e Can't be decided with the data given. yes Is it possible to calculate the amount of energy absorbed or released by reaction (1) using only the data above? no

Consider the following data for aluminum: atomic mass 26.982 mol electronegativity 1.61 kJ 42.5 mol electron affinity kJ 577.5 mol ionization energy kJ 10.7 mol heat of fusion You may find additional useful data in the ALEKS Data tab. Does the following reaction absorb or release energy? release absorb (1) Al(g) - Al (g) + e Can't be decided with the data given. yes Is it possible to calculate the amount of energy absorbed or released by reaction (1) using only the data above? no

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter9: Energy And Chemistry

Section: Chapter Questions

Problem 9.53PAE: 9.53 Using these reactions, find the standard enthalpy change for the formation of 1 mol of PhO(s)...

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A wad of steel wool (specific heat=0.45J/gC) at 25C is misplaced in a microwave oven, which later is accidentally turned on high. The oven generates microwaves of 13.5 cm wavelength at the rate of 925 moles of those photons per second. All of the photons are converted to high-heat energy, raising the temperature of the steel wool. Steel wool reacts explosively with the oxygen in the oven when the steel wool reaches 400.0C. If the steel wool explodes after 1.55 seconds, how many grams of steel wool were accidentally put into the oven?
9.83 A student performing a calorimetry experiment combined 100.0 mL of 0.50 M HCl and 100.0 mL of 0.50 M NaOH in a coffee cup calorimeter. Both solutions were initially at 20.0°C, but when the two were mixed, the temperature rose to 23.2°C. (a) Suppose the experiment is repeated in the same calorimeter but this time using 200 mL of 0.50 M HCl and 200.0 mL of 0.50 M NaOH. Will the T observed he greater than, less than, or equal to that in the first experiment, and why? (b) Suppose that the experiment is repeated once again in the same calorimeter, this time using 100 mL of 1.00 M HCl and 100.0 mL of 1.00 M NaOH. Will the T observed he greater than, less than, or equal to that in the first experiment, and why?
The reaction SO3(g)+H2O(l)H2SO4(aq) is the last step in the commercial production of sulfuric acid. The enthalpy change for this reaction is 227 kJ. In designing a sulfuric acid plant, is it necessary to provide for heating or cooling of the reaction mixture? Explain.
The reaction between magnesium metal and water (l) produces solid magnesium hydroxide and hydrogen gas. Calculate G for the formation of one mole of Mg(OH)2 at 27C and at 39C.
9.61 Silane, SiH4, burns according to the reaction, SiH4+2O2SiO2+2H2O , with H=1429 kJ. How much energy is released if 15.7 g of silane is burned?
Explain in your own words what is meant by the term entropy. Explain how both matter spread and energy spread are related to the concept of entropy.
10.101 Fluorine reacts with liquid water to form gaseous hydrogen fluoride and oxygen. (a) Write a balanced chemical equation for this reaction. (b) Use tabulated data to determine the free energy change for the reaction and comment on its spontaneity. (c) Use tabulated data to calculate the enthalpy change of the reaction. (d) Determine how much heat flows and in what direction when 34.5 g of fluorine gas is bubbled through excess water.
Given 2Cr2O3(s)4Cr(s)+3O2(g)H=+2269.4kJ (a) What is the heat of formation of chromium(III) oxide? (b) What is H for the formation of 13.65 g of chromium (III) oxide?
9.20 State the first law of thermodynamics briefly in your own words.
Define the standard enthalpy of formation. What are standard states for elements and for compounds? Using Hess's law, illustrate why the formula Hreaction=npHf(products)nfHf(reactants) works to calculate H for a reaction.
Use standard entropies and heats of formation to calculate G f at 25C for (a) cadmium(II) chloride (s). (b) methyl alcohol, CH3OH(l). (c) copper(I) sulfide (s).
A student performing a calorimetry experiment combined 100.0 ml. of 0.50 M HCI and 100.0 ml. of 0.50 M NaOH in a StyrofoamTM cup calorimeter. Both solutions were initially at 20.0 C, but when the two were mixed, the temperature rose to 23.2 C (a) Suppose the experiment is repeated in the same calorimeter but this time using 200 mL of 0.50 M HCl and 200.0 ml of 0.50 M NaOH. WIII the AT observed be greater than, less than, or equal to that in the first experiment, and why? (b) Suppose that the experiment is repeated once again in the same calorimeter, this time using 100 mL of 1.00 M HCI and 100.0 ml. of 1.00 M NaOH. Will the T observed be greater than, less than, or equal to that in the first experiment, and why?