Assuming the coins are in mint condition, they don't. PCGS shows the nominal weight for both Morgan and Peace dollars as 26.73 gm.
The US struck a gold and silver one dollar coin in 1878, post new question as to type of coin.
Assuming the coin is circulated and still in collectible condition. The 1878-S Morgan dollar is worth from $31.00-$44.00 depending on the grade of the coin.
Your 1922 Liberty dollar is actually a 1922 PEACE dollar. The 1922 date is the most common and assuming the coin is circulated and has no mintmark, retail values are $31.00-$37.00 depending on how much wear the coin shows.
The Liberty head design was used on over several different coins in 1878. Please post a new question with the coin's denomination, with the wording "What is the value of an 1878 US (coin denomination)?" e.g. What is the value of an 1878 US silver dollar? or What is the value of an 1878 US 10 dollar gold piece.
The 1922 silver dollar, commonly known as the Peace dollar, contains 90% silver and 10% copper. Each coin weighs approximately 26.73 grams, with about 24.06 grams of that being silver. This composition was standard for U.S. silver dollars minted from 1878 to 1935.
do you know how much money a silver 1872 dollar coin is and a 1922 silver dollar coin
90%
The Philadelphia issue (no mintmark) 1878 Trade Dollar is a Proof only coin with a retail value of about $1,000.00 but take it to a dealer for a assessment.
The coin is a 1878 Morgan silver dollar and is common with values of $17.00-$31.00 in average circulated condition
Assuming the coin has no mintark, the 1922 PEACE dollar is the highest mintage and most common coin of the series. Circulated examples are $31.00-$37.00
Assuming the coin has no mintark, the 1922 PEACE dollar is the highest mintage and most common coin of the series. Circulated examples are $23.00-$27.00
The coin is NOT an Liberty silver dollar, it's a PEACE dollar (1921-1935) and assuming the coin is circulated and has no mintmark, retail values are $28.00-$32.00 the 1922 coin is the highest mintage most common date of the series.