Answer
$1.09\times10^{23}\ molecules$
Work Step by Step
Convert grams into moles using the molar mass then multiply by avagadro's number to get the number of molecules.
$19.3g\ C_{8}H_{10}\times\frac{1mol\ C_{8}H_{10}}{106.17g\ C_{8}H_{10}}\times\frac{6.022\times10^{23}\ molecules}{1\ mol}= 1.09\times10^{23}\ molecules$
