Final answer:
The statement is false because requirements contracts can be enforceable without specifying a definite quantity, depending on the buyer's good faith needs.
Step-by-step explanation:
The statement that contracts in which one party agrees to buy all his requirements of certain goods from the other party are generally unenforceable because there is no definite amount is false. Such contracts are known as requirements contracts, and they can be enforceable even though they do not specify a definite quantity. The enforceability comes from the understanding that the buyer will act in good faith and not demand an unreasonably large quantity that the seller cannot supply. The quantity is determined by the actual needs of the buyer.