Calculate the number of moles in 2.60 grams of SnO2 ? Please show your work to receive credit.

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains

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?