For 'percent' solutions:
Many reagents are mixed as percent concentrations. When working with a dry chemical it is mixed as dry mass (g) per volume where #g/100 ml = percent concentration. A 30% solution is equal to 30 g dissolved in 100 ml of solvent.
I can convert this to non metric measurements.
1 US gallon = 3785ml and
1 lb = 453g
About 2.5 lbs per gallon of water.
Good luck.
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