skrillex88
20.02.2022 •
Chemistry
Calcium-49, a radioactive isotope, has a half-life of 9 minutes. If an 80-gram sample of the isotope decays for 27 minutes, how many grams of the original sample remain?
Select one:
a. 60
b. 10
c. 40
d. 20
Solved
Show answers
More tips
- C Computers and Internet 3D Glasses! What is this thing?...
- C Computers and Internet How to insert videos into LiveJournal?...
- C Computers and Internet How Much Does an iPhone Cost in America?...
- F Family and Home How to Choose the Best Diapers for Your Baby?...
- F Family and Home Parquet or laminate, which is better?...
- L Leisure and Entertainment How to Properly Wind Fishing Line onto a Reel?...
- L Leisure and Entertainment How to Make a Paper Boat in Simple Steps...
- T Travel and tourism Maldives Adventures: What is the Best Season to Visit the Luxurious Beaches?...
- H Health and Medicine Kinesiology: What is it and How Does it Work?...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
Answers on questions: Chemistry
- C Chemistry Which two domains contain microscopic, unicelluar organisms? *...
- C Chemistry The reader can tell from the Article that A. countries that emit high levels of carbon cause problems not only in their own backyards but around the entire world zero-carbon...
- C Chemistry How many molecules of water are produced when (6.09x10^1) g of oxygen react according to the following balanced chemical equation 4NH3(g) + 7O2(g) → 4NO2(g) + 6H2O(g)...
- H History What is the name we use to remember Germany’s attempt at Jewish genocide?...
- H History In two paragraphs, explain the problems that occurred during Reconstruction, and make a prediction about how Reconstruction will end. Do you think Reconstruction policies...
- E English You should finish your homework before going to the party . active to passive voice...
- M Mathematics Choose the graph of this equation y 2.5...
Ответ:
In this case Calcium-49 has a half-life of 9 minutes and is allowed to decay for 27 minutes, meaning the sample experienced 3 half-lives.
80g of Calcium-49 allowed to decay for 9 minutes results in 40g of Calcium-49 (half-life 1)
40g of Calcium-49 allowed to decay for 9 minutes results in 20g of Calcium-49 (half-life 2)
20g of Calcium-49 allowed to decay for 9 minutes results in 10g of Calcium-49 (half-life 3)
b) 10g of Calcium-49 remains after 27 minutes of decay
hope this helps :)
Ответ:
594.75 feet
Step-by-step explanation:
11.7/6=1.95
1.95*305=594.75