Iraqi weapons have been acquired from a variety of sources, largely Soviet but also Western. At least one German company sold Iraq deadly mycotoxins. Iraq could have obtained cyanides from the Soviet Union. United States US troops are either ready or not quite ready for the deadline, depending on which US official is to be believed. The calculations appear to focus primarily on aircraft and weapons systems, not on defensive equipment.
Iraqi missiles are either mobile or defended.
The refineries are neither, Congress having rejected US antimissile defenses. Against chemical weapons, the Iraqis have steel personnel shelters with the best ventilation-filtration equipment in the world, and the US Marines have tents. US troops have chemical detection equipment and antidotes for some agents in the Iraqi arsenal. The Iranians used 10 to 15 injectors, rather than three. One of the nerve agents, soman, forms such a tight bond with acetylcholinesterase that these antidotes are ineffective.