If you are asked to make 40 mL of a 1.0% (w/v %) agarose gel, how many grams of agarose will you add to the 40ml of buffer

0.4g

Explanation:

1.0% (w/v%) = 1 g of agarose 100 ml of Tris-Acetate-EDTA, this is the buffer that agarose is run with

the amount of agarose for 40 ml = 1 / 100 * 40 ml = 0.4 g