Calculá la masa que corresponda en cada caso. a) Se prepara una solución con 250 cm3 de agua y 20 g de azúcar. Si la densidad del agua es de 1 g/cm3, ¿cuál es la masa de solución?
b) Se sabe que en 350 g de una solución acuosa hay disueltos 12 g de sulfato cúprico. ¿Qué masa de agua se utilizó para preparar la solución?

AYUDA POR FAVOR, ES PARA MI FINAL

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)