text: you have a 1l aqueous solution of 50%v/v methanol (specific gravity 0.792g/ml, molecular weight 32). what is t you have a 1l aqueous solution of 50%v/v methanol (specific gravity 0.792g/ml, molecular weight 32). what is the concentration of methanol in moles/litre? ok, so you have 500 ml of methanol. a specific gravity of .792 g/ml means there are 396 grams of methanol. concentration (molarity) is moles per liter. so those are theu nits you want. so you take 396 grams of methanol and divide it by the molecular weight (32) to get 12.375 moles. however, that is for 500 ml or .5 l. you want 1 l. so you multiply it by 2. your answer shoudl be 24.75 moles/liter.   hope this helps and keep up the good work.