assuming 25g means 25 grams, this is much much less than 1 cup. more like a teaspoon full of butter.
One stick of butter is one half cup, whether solid or melted.
1.5 pounds of butter ≈ 2.964777583098 US cups 1.5 sticks of butter ≈ 0.741194395775 US cup
1 1/2
3/4 of a cup