Question 252478
How much sugar (g) do I need to make a 20% solution, total volume = 1 gallon?
:
1 gal of water weighs 
:
If the solution is 20% sugar by weight, take the weight of one gallon of water and multiply by 20%: 

One gallon of water weighs 8.34 lbs 

0.2 * 8.34 = 1.668 lbs.