Final answer:
The power denied to the federal government by the Constitution is the power to coin money.
Step-by-step explanation:
The Constitution denies the federal government the power to coin money. This power is not given to the federal government but is instead reserved for Congress. The power to coin money is an exclusive power of the federal government according to Article I, Section 8 of the Constitution. This means that only the federal government has the authority to print and regulate currency.