答：NaNO3 的M = 85.00 g/mol
【1】100ml 1.4mol/L的NaNO3的物质的量 n = 1.4 x100/1000 = 0.14 mol
【2】NaNO3的质量 m = nM = 0.14 mol x 85.00 g/mol = 11.9 g