What is the change in enthalpy for the combustion reaction of butane, c4h10? 2c4h10(g) + 13o2(g) → 10h2o(g) + 8co2(g) given: c4h10(g): δhf °= –125 kj h2o(g): δhf °= –242 kj co2(g): δhf °= –393.5 kj –510.5 kj –5318 kj –54468 kj –5818 kj done

it was spontaneous.

"ain't i a woman? " is the name given to a speech, delivered extemporaneously, by sojourner truth, (1797–1883), born into slavery in new york state.sojourner truth' delivered her famous speech "ain't i a woman? " (which did not have a title at that moment) was given without any previous preparation. her dissertation took place at the women's convention in akron, ohio, in 1851.