How many moles of glucose, C_6H_12O_6, are in 300 g of glucose?

There are 2 moles of $\text{C"_6"H"_12"O"_6}$ in 300 g $\text{C"_6"H"_12"O"_6}$, rounded to one significant figure.
First determine the molar mass (mass of one mole) of glucose, which is $\text{180.15588 g/mol}$. http://pubchem.ncbi.nlm.nih.gov/compound/5793
$300 \text{g C"_6"H"_12"O"_6xx(1"mol C"_6"H"_12"O"_6)/(180.15588"g C"_6"H"_12"O"_6)="2 mol C"_6"H"_12"O"_6}$ ($1.7$ rounded to one significant figure)