What is the percent by mass of a solution containing 4.0g of solute in 100g of water? (Percent by mass formula: (mass of solute/mass of solution) x 100) A 40 % B. 3.8 % 26 % D. 2.1 %

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