Una masa de sulfato de niquel ii se encuentra contenida en 200ml de solucion al 6% en masa de sulfato de níquel ii con una densidad de la solución de 1.06g/ml . la cantidad de masa de sulfato de níquel ii contenida es:

The solution contains 13 g NiSO₄.

First, calculate the mass of the solution.

Mass of solution = 200 mL solution × (1.06 g solution/1 mL solution) = 212 g solution

Then, calculate the mass of NiSO₄.

Mass of NiSO₄ = 212g solution × (6 g NiSO₄/100 g solution) = 13 g NiSO₄

Note: The answer can have only one significant figure because that is all you gave for the mass % of NiSO₄.  However, I calculated the answer to two significant figures.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

5.6⋅10−^19  j

do you need the explaination?