A weather balloon contains 394 L of hydrogen gas at STP. How many moles of hydrogen are present?

What is the formula that this ionic compounds could form sr2+p3-o2-

2. how is heavy water different from normal water

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