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

Select the correct answer. which statement is true about a polarized object? o a. it gains electrons and becomes negatively charged. ob. it gains protons and becomes positively charged. oc. the number of positive and negative charges can be the same. od. it has to be a metal. o e. there is no change in the distribution of the charge in the object. reset next what

Achemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules