(Solved): 2) 6.59g of tungsten (V) sulfate is dissolved in 138.3g of H2O. What is the concentration of ...

2) $$6.59\mathrm{g}$$ of tungsten (V) sulfate is dissolved in $$138.3\mathrm{g}$$ of $${\mathrm{H}}_2\mathrm{O}$$. What is the concentration of tungsten (V) sulfate? Tungsten ions? Sulfate ions? Assume the salt does not contribute to the volume (i.e. the volume comes only from the solvent $$)\left(\mathrm{r}=0.99879\mathrm{g}{\mathrm{H}}_2\mathrm{O}/{\mathrm{cm}}^3{\mathrm{H}}_2\mathrm{O}\right)$$. 3) A fuel mixture is composed of two liquids, hydrazine $$\left({\mathrm{N}}_2{\mathrm{H}}_4\right)$$ and dinitrogen tetraoxide. When they react, they produce nitrogen gas and water vapor. How many grams of nitrogen form when $$5.32\mathrm{kg}$$ of hydrazine and $$8.90\mathrm{kg}$$ of dinitrogen tetraoxide are mixed?