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4. The standard heat of forrmation of isobutane cannot be measured directly but can be determined indirectly from other heats

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C(s) & 02 (9) CO₂ (9) , AH = -393.5 KJ ... H2(g) + 12 02 (9) H04), 4H = -285.8 kJ .... ③ Culto + 6 1/20 (9) Uco (9) + 5 H₂0W)

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4. The standard heat of forrmation of isobutane cannot be measured directly but can be determined...
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