1. Calculate the heat (in kJ) associated with the cooling of 395 g of mercury from 71.8°C to 12.0°C.? 2. Determine the a

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1. Calculate the heat (in kJ) associated with thecooling of 395 g of mercury from 71.8°C to 12.0°C.?
2. Determine the amount of heat (in kJ) associatedwith the production of 1.44 ×104 gof NO2
according to the following equation:2 NO(g) + O2(g) 2NO2(g)
ΔH = −114.6 kJ/mol
Enter your answer in scientific notation.
___ x 10___kJ
3. Consider the reaction
If 2.0 moles of H2O(g) are converted toH2(g) and O2(g) against apressure of 1.0 atm at 135°C, what is ΔU for thisreaction?
4.The standard enthalpies of formation of ions inaqueous solutions are obtained by arbitrarily assigning a value ofzero to H ions; thatis, ΔHof [H+(aq)] =0.
(a) For the following reaction
HCl(g)H+(aq) +Cl−(aq) ΔHorxn=−74.9 kJ/mol
calculate ΔHof for theCl− ions.
___kJ/mol
(b) Giventhat ΔHofforOH− ions is −229.6 kJ/mol, calculate the enthalpyof neutralization when 1 mole of a strong monoprotic acid (such asHCl) is titrated by 1 mole of a strong base (such as KOH) at25°C. ___ kJ/mol
5. The work done to compress a gas is 87.0 J. As aresult, 31.0 J of heat is given off to the surroundings. Calculatethe change in energy of the gas.
___J
6. A gas expands from2.50 ×102 mL to 949 mL at a constanttemperature. Calculate the work done (in joules) by the gas if itexpands
(a) against a vacuum.
w = ____ J
(b) against a constant pressure of 4.00atm.
w = ____ J
7. An iron bar of mass 514 g cools from 83.0°C to4.0°C. Calculate the metal's heat change (inkilojoules).
____ kJ
8. Calculate the heat (in kJ) associated with 296 gof white phosphorus burning in air according to theequation
___10x___kJ (Enter your answer in scientificnotation.)
9. Consider the reaction
H2(g) +Cl2(g) →2HCl(g) ΔH = −184.6kJ / mol
If 7.00 moles of H2 react with 7.00moles of Cl2 to form HCl, what isΔU (in kJ) for this reaction at 1.0atm and 25°C?
Assume the reaction goes tocompletion.
___kJ
10. A 4.62−kg piece of copper metal is heatedfrom 22.5°C to 320.3°C. Calculate the heat absorbed (inkJ) by the metal. The specific heat of copper is 0.385J/g ·°C.
___10x___kJ
11. A gas expands anddoes P-V work on the surroundings equal to 284J. At the same time, it absorbs 201 J of heat from thesurroundings. What is the change in energy of thesystem?
___J