3. [cr(en)3] CL3 what is oxidation number

How much heat is released upon converting one mole of steam (18.0 g) from 100.0 ∘c to water at 25.0 ∘c? show work and constants, trying to figure out how it works. only given the heat capacity for steam and water so try to only use that

Analyze how limestone is weathered and identify the features that are formed as a result of this dissolution

Can someone me with 3 and 4 plz. this is for masteries test.