Answer
$1.85 \times 10^3g$
Work Step by Step
1 gal = 3785.4 mL
Density = Mass/Volume
Mass = Density $\times$ Volume
Mass = $1 gal \times \frac{3785.4mL}{1gal} \times\frac{1.28g}{mL} \times \frac{38.1g}{100g}$ = $1.85 \times 10^3g$
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