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A mixture weighing 7.290mgcontained only cyclohexane, ${\mathbf{C}}_{\mathbf{6}}{\mathbf{H}}_{\mathbf{12}}$(FM 84.159), and oxirane, ${\mathbf{C}}_{\mathbf{2}}{\mathbf{H}}_{\mathbf{4}}\mathbf{O}$(FM 44.052). When the mixture was analyzed by combustion analysis, 21.999mg of${\mathbf{CO}}_{\mathbf{2}}$(FM 44.009) were produced. Find the weight percent of oxirane in mixture.

Why is high relative supersaturation undesirable in a gravimetric precipitation?

An alloy contains$\mathbf{~}\mathbf{2}\mathbf{.}\mathbf{0}$ wt% Ni. What volume of 0.83 wt% DMG should be used to provide a 50%excess of DMG for the analysis of 1.8 g of steel? What mass of$\mathbf{Ni}\mathbf{(}\mathbf{DMG}{\mathbf{)}}_{\mathbf{2}}$ precipitate is expected?

Why are many ionic precipitates washed with electrolyte solution instead of pure water?

Why is it less desirable to wash AgCl precipitate with aqueous NaNO3 than with HNO3 solution?