1) Mass percent
[tex]\%=\frac{gramsofsolute_{}}{gramsofsolution}\cdot100[/tex]2) List known values
Sample: 0.965 kg
[tex]g=0.965kg\cdot\frac{1000g}{1kg}=965g[/tex]2) Plug in known values and solve for grams of solute.
[tex]27.3\%=\frac{\text{grams of solute}}{965\text{ g solution}}\cdot100[/tex][tex]gSolute_{}=27.3\cdot\frac{965\text{ g solution}}{100}_{}=263.445\text{ g solution}[/tex]3) Convert grams of solute to moles
The molar mass of the unknown compound is 25.2 g/mol
[tex]mol_{}=263.445g\cdot\frac{1mol_{}}{25.2g_{}}=10.45mol_{}[/tex]There are 10.45 moles of the unknown compound present in the sample.
