Using the standard molar entropies below, calculate the standard entropy change, δs∘ , for the “water-splitting” reaction at 298 k: 2h2o(l) → 2h2(g) o2(g) standard molar entropies of selected substances at 298 k substance s∘ (j/mol⋅k) h2(g) 130.6 o2(g) 205.0 h2o(g) 188.8 h2o(l) 69.9

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?