averylorenhoffman
05.07.2019 •
Chemistry
The half-life of radon-222 is 3.8 days. if a sample currently contains 3.1 grams of radon-222, how much radon-222 did this sample have 15.2 days ago? a 12.4 grams b 47.1 grams c 49.6 grams d 57.8 grams
Solved
Show answers
More tips
- S Style and Beauty Tricks and Tips: How to Get Rid of Freckles...
- H Health and Medicine What is Autism? Understanding the Basics of This Neurodevelopmental Disorder...
- F Food and Cooking The Most Delicious and Simple Fish in Batter Recipe...
- S Society and Politics 10 Tips for Boosting Your Self-Esteem...
- F Food and Cooking Which Calamari Salad is the Most Delicious?...
- H Health and Medicine Mercury Thermometer Danger: What to do when a thermometer breaks?...
- S Style and Beauty How to braid friendship bracelets?...
- F Food and Cooking Delight for Gourmets: How to Prepare Liver Pate...
- C Computers and Internet How to Learn to Type Fast?...
- H Health and Medicine Angina: Causes, Symptoms, and Treatment...
Answers on questions: Chemistry
- C Chemistry D Which compound is insoluble in water?...
- C Chemistry What are the layers of the sun s atmosphere based on the brief descriptions provided...
- C Chemistry What are products of the light reactions of photosynthesis that are utilized in the calvin cycle?...
- C Chemistry How much pressure does the lid exert on the gas? the lid is 10kg...
- C Chemistry Identify all of the following that are chemical changes: a. leaves turning color in the fall b. dew forms on a blade of grass c. ethanol evaporates d.sugar dissolves...
- C Chemistry What is a rechargeable battery? a group of electrochemical cells that can be recharged a group of electrolytic cells that can be recharged a group of electrochemical...
- C Chemistry Use the graph to answer the following questions. What is the solubility of KNO3 in 100 g of water at 60 Celsius? A. 28 g/100 g of H2O B. 38 g/100 g of H2O C.45g / 100g...
- C Chemistry Thinking question: Why do you think plants need those THREE things in order to survive? Does it remind you of anything else? Your answer This is a required question...
- C Chemistry MgCl2 (aq) + K2SO4 (aq) -- 2KCl (aq) + MgSO4 (s) how many moles of potassium chloride are produced from 4.8 moles of magnesium chloride...
- C Chemistry Cuantos gramos hay en 3 mol de NaCI?...
Ответ:
The number of grams of radon 222 did it have 15.2 ago was 49.6 grams( answer C)
calculation
calculate the number of half life it has covered from 15.2 days to 3.8 daysthat is divide 15.2/ 3.8 = 4 half life
half life is time taken for a radio activity of a specified isotope to fall to half its original masstherefore 3.8 days ago it was 3.1 x2 = 6.2 grams
7.6 days ago it was 6.2 x2 = 12.4 grams
11.4 days ago it was 12.4 x2= 24.8 grams
15.2 days ago it was 24.8 x2=49.6 grams
Ответ:
answer:
i cant see the picture all too well.
explanation: