The value of gold dollars depends upon the year of mintage, which mint facility struck the coin and the condition of the coin. Please examine the coin again and post a new question containing this information.
You need to be more specific. There have not been any gold dollars released by the US Mint since 1889 for circulation (minus some minor collector editions before 1933) and there are no gold dollars dated 1978 struck by the US Mint. Instead you either have a gold plated 1978 dollar coin (which would just be worth $1) or you have a dollar coin issued by a different country or private mint.
what is 2 kg of gold in US dollars
One bank roll of dollars contains 25 coins, so the roll is worth $25.
In us Dollars a 5 florin coin would be worth about 8-10 dollars if it is in mint condition
No gold Bicentennial coins of any kind were made by the US Mint, many common dollars, half dollars and quarters have been gold plated and sold as "Collectibles" for inflated prices.
If it is a US ten dollar coin, it is worth at least 800 dollars, and maybe more, depending on the condition and the mint information.
It isn't. The US mint has never made gold quarters, your coin is plated assuming the coin is the same diameter as a normal quarter. Your coin is only worth 25 cents.
None of the Presidential dollar coins made for general circulation contain any gold or are worth more than face value. Only Proof and collectors coins sold from the US Mint are worth more.
A 1999 US Mint 50 State Quarters Proof Set is worth about five US dollars. However, a 1999-2008 US Mint 50 State Quarters Proof Set is worth about 100 US dollars.
If you are referring to the modern "golden dollars" produced by the US mint with the Statue of Liberty on the reverse, it is worth $1, just spend it unless it is in mint packaging. If it is in mint packaging it is worth about $1.25-3 depending on what it is (proof vs. uncirculated, etc.)
This did not come from the mint like that. It has to be gold plated. No collector value.
80,000