What is the molecular formula of the molecule that has an empirical formula of C 2 H 2 O and a molar mass of 252, 22g / mol?

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?

A40 kilogram skier starts at the top of a 12 meter high slope. at the bottom, she is travelling 10 meters per second. how much energy does she lose to friction