The calculated distance (air line) between Mosul and Al Ḩasakah is approximately 132 miles respectively 213 kilometers.
By car or train, the actual journey to Al Ḩasakah is certainly longer, as only the direct route (as the crow flies) between Mosul and Al Ḩasakah has been calculated here.
Air line (approximately)
213 kilometers
115 nautical miles