Calculte AJP for the combustion of onia Apr NOgin 33. ir500 gofbe C 25.0Cabsbs 2

Question

Calculte AJP for the combustion of onia Apr NOgin 33. ir500 gofbe C 25.0Cabsbs 271 U of ngy in the fom ofheat, what is the final temperture of L The thermochemical equacion for the combustion of methanol is shown below Wha is the enhalpy change for the combustion of 8.59 gCHOH7 4-549 10w ide reacts with alumium in an exothermic reaction The meaction of s00 FeO with excess Alb) evolves 26.6 kJ of enengy in the form of heat. Cakculate the enthalpy -5.32 Uimol chainge per mole of FeO, reacted 4-2.12 10mol Page 2

Explanation / Answer

(7)

Using relation:

Q = m*C*dT

Putting values:

2710 = 50*1.72*dT

So,

dT = 31.51

So,

Final temp = 25+31.5 = 56.50C

(8)

Moles of methanol taken = Mass/MW = 8.59/32 = 0.268

So,

dH = -638.7*0.268 = -171 kJ

(9)

Moles of iron oxide taken = Mass/MW = 5/159.7 = 0.0313

So,

dHrxn = -26.6/0.0313 = -8.50*102 kJ/mol

Hope this helps !

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