Can someone tell me the answer to these please? :(

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

How to convert a density of 0.791g/cm3 to lb/ft3

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?