Question

SO2(g) + H2O(l)= H2SO(l)

What mass of sulfur dioxide is needed to prepare 36.86 g of H2SO3(l)

Answer 1

gotta work with moles.

How many moles H2SO3 in 36.86g?
Since each mole of H2SO3 requires 1 mole of SO2, you need the same number of moles.
So, convert back to g of SO2

Answer 2

28.77