Use the data in Appendix B in the textbook to calculate ΔH∘ΔH∘ (in kilojoules) for the reaction. Express your answer using four significant figures. ΔH∘fΔHf∘ = nothing kJkJ SubmitRequest Answer Part B The entropy change for the reaction is ΔS∘ΔS∘ = +36.7J/KJ/K. Is the reaction spontaneous at 25 ∘C∘C? The entropy change for the reaction is = +36.7. Is the reaction spontaneous at 25 ? Yes No

Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

How are isotopes of the same chemical element alike? how are they different?