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Calculate the change in the enthalpy when 52.0 g of solid chrominium at 25*C and 1 atm pressure is oxidized. (Delta Hf for Cr2O3(s) is -1135 Kj/Mol.)4Cr(S) +3 O2(g) = 2Cr2O3 (s). A. -1135B. -284 KjC. -568 KjD. 1135 KjE. 568 Kj

Question

Calculate the change in the enthalpy when 52.0 g of solid chrominium at 25*C and 1 atm pressure is oxidized. (Delta Hf for Cr2O3(s) is -1135 Kj/Mol.)

4Cr(S) +3 O2(g) = 2Cr2O3 (s). 

A. -1135

B. -284 Kj

C. -568 Kj

D. 1135 Kj

E. 568 Kj

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Step 1

Molar mass of chromium is 52g/mol, which means 1mol of Cr = 52g of Cr.  According to stoichiom...

4mol of Cr 2mol Cr,03 1mol of Cr -0.5mol Cr,O
AH/mol for Cr O3 = -1135kJ/mol
AH of reaction:1135kJ/mol _567.5kJ/mol
=
2
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4mol of Cr 2mol Cr,03 1mol of Cr -0.5mol Cr,O AH/mol for Cr O3 = -1135kJ/mol AH of reaction:1135kJ/mol _567.5kJ/mol = 2

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