¿Qué cantidad de agua es necesaria para obtener 250 gr de una solución al 12 % en masa de sulfato de sodio?

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

What is the mass of 8 moles of sodium atoms

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.