Asked by John

4Al(s) + 3O2(g)2Al2O3(s)
Delta H reaction = -3351.4 kJ

How much energy is transferred when 42.6 g of aluminum reacts to form aluminum oxide?

Thanks
Answered by bobpursley
well, four moles of Al yields 3351J

figure the moles of Al in 42.6g

moles= 42.6/atomicmassAl

molesgiven/4=Heat/3351.4kJ
solve for Heat.
Answered by John
When calculating the moles of Al in 42.6 g, do you multiply the molar mass by four or just Mr of one Al atom?
Thanks
Answered by bobpursley
moles= 42.6g/26.9

(42.6/26.9)/4=heat/3351J

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