For the following reaction scheme, percentage yields are given along the arrow:
\( x \) \( \text{g} \) and \( y \) \( \text{g} \) are mass of \( R \) and \( U \), respectively.
(Use: Molar mass (in \( \text{g mol}^{-1} \)) of \( \mathrm{H} \), \( \mathrm{C} \) and \( \mathrm{O} \) as \( 1 \), \( 12 \) and \( 16 \), respectively)
The value of \( y \) is ______.
