![lovelylife7553](/avatars/49403.jpg)
lovelylife7553
12.05.2021 •
Chemistry
How many units long is the circumference of a circle with diameter of 18 units?
Solved
Show answers
More tips
- A Auto and Moto Experience the World of the Most Expensive Cars on the Planet...
- S Style and Beauty How to Get Rid of a Double Chin?...
- F Food and Cooking How to Cook Julienne? Recipes and Tips...
- D Dating, Love, Relationships 10 Useful Tips on How to Survive a Breakup?...
- F Food and Cooking Apple Cider Vinegar: The Ultimate Health and Beauty Solution...
- C Computers and Internet Е-head: How it Simplifies Life for Users?...
- 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...
Answers on questions: Chemistry
- C Chemistry One question for chem? ? image attached?! : )...
- C Chemistry Carbon dioxide has bonds. O ionic O noncovalent O polar covalent O magnetic O none of the above...
- C Chemistry Plants grow in many different shapes and sizes. Much of their shape depends on an internal structure that is composed of carbon-containing molecules such as cellulose and lignin....
- C Chemistry Explain the four properties of air that determines how it circulates in the air. Make sure to include the following terminology: saturation point, adiabatic cooling, adiabatic...
- C Chemistry G 2BrO3- + 5SnO22-+ H2O5SnO32- + Br2+ 2OH- In the above reaction, the oxidation state of tin changes from to . How many electrons are transferred in the reaction...
- H Health Please help me I’ll give brainlist they are only true or false questions...
- H History Question 23 (4 points) Virus are considered adapted because they are host-specific. This means that a b they can be transferred on objects they are destroyed by water they can...
- C Chemistry A car left from its initial position at 6 pm. The car arrived at its final position at 11pm. How much time did it take the car to arrive ?...
- B Biology 2. Which type of tissue covers the surface of the body?...
- H History How does industrialization in the U.S led to urbanization...
Ответ:
56.52 units
Explanation:
hope that helps :)
Ответ:
Does this help
Ответ:
Explanation:
For every hal-life time the amount of the radioisotope (fluorine-18) will be cut to half.
Part a.
Since the half-life of fluorine-18 is 110 min, ater this very time, half of the fluorine-18 is still alive, i.e 100. mg / 2 = 50.0 mg. ← answer
Part b.
Compute the time elapsed from 8:00 am, when the fluorine-18 is shipped, to 1:30 pm, when the sample arrives at teh radiology laboratory.
1:30 pm - 8:00 am = 5 hours and 30 minutesConvert to minutes+ 5×60 + 30 = 330 minCompute the number of half-lives in 330 min:
330 min / 110 min per half-life = 3 half-lives.Conclusion:
the radiosotope has been reduced to half 3 times 100.0 mg × (1/2) × (1/2) × (1/2) = 100.0 mg × (1/2)³ = 100.0 mg / 8 = 12.5 mgHence, 12.5 mg of the radioisotope are still alive ← answer