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Pre-lab Study Questions 1. Calculate the enthalpy of reaction DHrxno for each of the following reactions using the t...

Pre-lab Study Questions

1. Calculate the enthalpy of reaction DHrxno for each of the following reactions using the tabulated standard enthalpy of formation DHfo. (Show calculation)

a. H2O(g) ® H2O(l)

b. CaCO3(s) ® CaO(s) + CO2(g)

c. CH4(g) + 2 O2(g) ® CO2(g) + 2 H2O(g)

2. Consider the following reaction and the given standard enthalpy of formation DHfo.

NH4NO3(s) ® NH4+(aq) + NO3-(aq)

DHfo (kJ/mol)

-365.6

-132.0

-205.0

a. Calculate the enthalpy of reaction DHrxno for the above reaction using the given standard enthalpy of formation DHfo. (Show calculation)

b. The above reaction equation represents the dissolving process of 1 mol of solid ammonium nitrate NH4NO3 in water. This process is endothermic or exothermic? This process will cause the temperature of the surroundings to rise or drop? Explain.

c. If 2.00 g of solid NH4NO3 is dissolved in 50.0 mL of water in a coffee-cup calorimeter, how much heat is released or absorbed? Show calculation. (Hint: the calculation in a gives the heat transferred when 1 mol of NH4NO3 is dissolved in water. If there are 2.00 g of NH4NO3, how many moles of NH4NO3 are there?)

d. Calculate the temperature change Dt of the 50.0 mL of water in the calorimeter if 2.00 g of solid NH4NO3 is dissolved in 50.0 mL of water. Show calculation.

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Answer #1

Da Hao(A) 4+6*1 = OHO} - A -a.9-(-241-8) -AA KJ b> caco (S) CaO(S) 9) AH AHeao A () -AHea - -G35-5+-33-5)-(-1207) 35-5-393-5+eHA (9)202 ) co ()+2H2o(9) AH AH +24hp£H20m)}-2x AHSo( -Anffet 393-5+2x (-2A1-8) -2% 0 - (-74.80) 293.5-483.6+74.80 -802.3 KJ

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