netermine t Fe(s) + 3 H20(e) Fe(OH)(s) + 32 H2(g) 112(g) + 1 /2 02(g) H20(t) Fe2

Question

netermine t Fe(s) + 3 H20(e) Fe(OH)(s) + 32 H2(g) 112(g) + 1 /2 02(g) H20(t) Fe2O3(s) + 3 H 20(1) 2 Fe(OH)3(s) he standard enthalpy of formation of Fe,0,(5) given the A,H=-285.8 kJ/mol-nn A.H +288.6 kJ/mol-rxn a.-252.6 kJ/mol-rxn b. +163.7 kJ/mol-rxn c.-824.2 kJ/mol-rxn d. +33.2 kJ/mol-rxn e. +890.6 kJ/mol-rxn 12. Given the thermochemical equation 4Ala3(s) + 302(g) 2A403(s) + 6a2(g),a,H =-529 kJ/mol-nn find ,H for the following reaction. a. 88.2 kJ/mol-rxn b. 264.5 kJ/mol-rxn c. 529 kJ/mol-rxn d. 176.3 kJ/mol-rxn e. -176.3 kJ/mol-rxn J of energy pe 13. A red laser pointer emits light at a wavelength of 488 nm. If the laser emits 7.5 x 10 form of visible radiation, how many photons per second are emitted from the laser? a. 4.1 x 10-19 photons/sec b. 5.4 × 10-16 photons/sec c. 8.98 1014 photons/sec d. 1.8 × 1015 photons/sec e. 2.5 × 10 18 photons/sec 14. Which of the following properties is associated with the value of the n quantum number? a. the number of electrons in an orbital b. the size of an orbital c. the orientation in space of an orbital d. the energy of an orbital e. the shape of an orbital

Explanation / Answer

11.

The enthalpy change of H2O formation multplication is wrong

the actual value is -857.4 kJ/mol

The enthalpy change for formation of Fe2O3 is comes out to be -824.2 kJ/mol

12.

given reaction is

4 AlCl3 (s) + 3O2 (g) ------> 2 Al2O3 (s) + 6 Cl2 (g)        deltaH = -529 kJ/mol ------1

divide the equation 1 with 6

2/3 AlCl3 (s) + 1/2O2 (g) ------> 1/3 Al2O3 (s) + Cl2 (g)        deltaH = -529 kJ/mol / 6 = - 88.167 kJ/mol ------2

reverse the equation 2

1/3 Al2O3 (s) + Cl2 (g) ----> 2/3 AlCl3 (s) + 1/2O2 (g)     deltaH = 88.167 kJ/mol

so answert is 88.167 kJ/mol

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