It depends what year the half dollar was made.
1964 - 12.5 g
1965-1970 - 11.5 g
1971 to now - 11.34 g
The U.S. did not mint any dollar coins in 1960.
A 1923 silver dollar weighs about 26.73 grams.
The '64 Kennedy half dollar contains 90% silver with 10% copper and weighs 12.5 grams. That's 11.25 grams of silver.
A 1896 silver dollar weighs approximately 26.73 grams.
Barber, Walking Liberty, Franklin, and 1964 Kennedy halves weigh 12.5 gm and were made of 90% silver, so they contain 11.25 gm of pure silver.
A 1972 silver dollar, known as the Eisenhower dollar, weighs about 24.59 grams. It is composed of 40% silver and 60% copper.
There are .1479 troy ounces of silver in a 1967 US Kennedy half dollar.
The actual amount of pure silver is .36169 of an ounce.
Kennedy half dollar coins dated 1965 through 1970 weigh 11.5 grams and are 40% silver - they thus contain 0.1479 troy ounces of silver.
It's not silver. None of the 1974 Kennedy halves are silver. Just spend it.
The coin is only 40% silver and has a value of $2.73 only the 1964 Kennedy half dollar was 90% silver.
No Kennedy half-dollar from 1971 to date made for general circulation contains any silver.