how many gram of NaNO3 are in 25cm3 of
0.01m NaNO3 solution?
Don't get too lazy in chemistry to use caps. 0.01m means 0.01 molal soln while 0.01M means 0.01 molar soln. I suspect you meant 0.01M. If so, then
mols = M x L = ?
Then grams = mols x molar mass