Question

determine the number of moles of squaric acid in 191.8 g

Answer 1

191.8/114.06 =1.68

Answer 2

find its molecular formula first C4H2O4
use this to find the weight in gram per mole by using the masses in the periodic table
\[4(C)+2(H)+4(O)= molar mass \]
once you fin that you can do this
\[191.8gC_{4}H_{2}O_{4}*\frac{1mole}{gmolarmass}\]
this should give you the correct answer =)