Answer:
4.5 grams of NaCl
Explanation:
A concentration of 0.900% (m/V) means that there are 0.9 grams of solute (in this case NaCl, that is, the substance that has been dissolved in another substance, making the solution) in 100 ml of solution. Then, the following proportion applies:
(0.9 grams of NaCl)/(100 ml of solution) = (x grams of NaCl)/(500 ml of solution)
(0.9/100)*500 = x
4.5 grams of NaCl = x
