Made up of 92% hydrogen and almost 8% helium
what is the word I really need help

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

How many moles of no2 will form when 3.3 moles of cu are reacted with excess hno3?

If a particle has z = 25 and 23 electrons, what is its charge?