The equation to solve problem is (M1) (V1) = (M2) (V2) M1= 10M, V1= original NaOH solution, M2= 0.5 M, V2= 2L First, the answer needs to be in ml., so convert 2L to ml = 2000ml (10M) (V1) = (0.5M) (2000ml) (10M)(V1) = 1000 M/ml V1 = 1000M/ml / 10M, the Mmoles cancel out leaving just ml. V1 = 100ml, which is the original NaOH solution needed.
Simply put, you can go from moles to grams and vice versa by using the mass of 1 mole of that substance, i.e its molar mass. For example, the molar mass of carbon is 12.011 g/mol. This means that 1 mole of carbon, or 6.022⋅1023 atoms of carbon, weigh 12.011 g.
