With a molar mass of 53.5 g/mol and weight of 2.35 g what is the number of moles? With a molar mass of 238 g/mol and a weight of 3.52g what is the number of moles? With a concentration of 14.3M and a volume of 8mL what is the number of moles? With a concetration of 30.0% by wt. and a volume of 10mL what is the number of moles? With a concentration of 12.0M and a volume of 1.5mL what is the number of moles?