when heating 1.25 g of a solid 280cm3 cube of a gas measured at STP were evolved and a resolve of 0.7g was left .calculate the molar mass of gas. molar volume of gas at STP is 22.4 dm cube​

Now consider the reaction when 45.0 g naoh have been added. what amount of naoh is this, and what amount of fecl3 can be consumed by it?

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?

What does a numerical subscript following an element in a chemical formula mean?