None in circulation-strike coins (Philadelphia, no mint mark, and Denver, "D" mint mark).
Some proof versions ("S" mint mark) were struck in 40% silver.
In a Bicentennial Eisenhower Dollar, there is 0% Silver, unless San Francisco(S) Proof Coin, some were minted in 40% Silver. Hope this helps.
One dollar.
Look at the coin again the date is 1776-1976 and has no silver in it and is still only a dollar.
Dwight Eisenhower is on the Bicentennial (1776-1976) Silver Dollar.
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One dollar.
The Morgan dollar is 90% silver, or contains about .77 troy ounce of pure silver.
It is made of 90 percent silver and 10 percent copper
.14792 oz of pure silver in a 40% half dollar.
It's still worth one dollar.
The 1976 silver dollar is only 40% silver. These sell for $4-5 dollars in internet auctions.
The 1776-1976 dollar was an Eisenhower dollar and the silver version has a current value from $14 to $325 depending upon the condition of the coin.