Verified answer

m(SO3) = 160 г               n(SO3) = m(SO3) / Mr(SO3) = 160 / 80 = 2 моль

Mr(SO3) = 80 г/моль      V(SO3) = n(SO3) * Vm = 2 * 22,4  = 44,8 л

Vm = 22,4 л/моль

V(SO3) = ?