Half dollars dated 1964 and earlier are made of an alloy of 90% silver and 10% copper.
These coins weigh 12.5 gm in new condition, so 90% of that is 11.25 gm.
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The actual amount of pure silver is .36169 of an ounce.
A 1936 Walking Liberty half dollar has .36169oz of silver.
Depends on what you want to know for. Some collectors will pay more than the $15 you could get for the silver content. Technically the silver dollar is worth about $30, but not many will pay that much. Might be an anomaly on it somewhere which raises value. If you're talking about the Kennedy half dollar, it is worth half as much for the silver value, maybe 3/4ths of the silver dollar. Not worth much to a collector.
The 1964 Kennedy half dollar, which is 90% silver, contains 0.3617 troy ounces of silver. The 1965-1970 Kennedy half dollars (as well as some 1976 coins issued for collectors), which are only 40% silver, contain 0.1479 troy ounces of silver. The silver proof Kennedy half dollars produced for collectors since 1992 are, like the 1964 coins, 90% silver and contain 0.3617 troy ounces of silver.
There are .3617 troy ounces of silver in a 1958 Franklin half dollar.