What volume (measured at stp) will 3.75 grams of helium gas occupy?

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

What is the lowest number energy level where a d sublevel is found

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4al(s)+3o2(g)→2al2o3(s) a) 1 molal, 1 mol o2 b) 4 molal, 2.6 mol o2 c) 16 molal, 13 mol o2 d) 7.4 molal, 6.5 mol o2