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How many grams of radium-222 remain in a 12-gram sample after 76 seconds?
After 76 seconds, half of the radium-222 would have decayed (its half-life is about 3.8 days). Therefore, the quantity of radium-222 remaining in the 12-gram sample would be 6 grams.
How many milligrams of a 15.0 mg sample of radium-226 remain after 6396 years if the half-life of radium-226 is 1599?
One sixteenth of a gram. 1st halflife- 1/2 gram 2nd, 1/4 3rd 1/8th 4th halflife, 1/16th
How old is a sample of granite that contains 8 grams of radioactive potassium-40 and 56 grams of its nonradioactive decay products?
Based on the ratio of 8 grams of radioactive potassium-40 to 56 grams of its nonradioactive decay products, we can infer that half of the initial potassium-40 has decayed. Since the half-life of potassium-40 is about 1.25 billion years, we can estimate the age of the sample to be around 1.25 billion years.
How long will it take 24 grams of plutonium -240 to Decay to 20 gram?
The half-life of plutonium-240 is about 6,560 years. If 24 grams decay to 20 grams, it represents a loss of 4 grams of plutonium. The time it would take for 24 grams to decay to 20 grams would depend on the specific decay rate and is typically calculated using exponential decay equations.
How long will it take 36 grams of plutonium 240 to decay to 12 grams?
The decay of plutonium-240 has a half-life of about 656 million years. To go from 36 grams to 12 grams would require two half-lives, so it would take approximately 1.3 billion years for 36 grams of plutonium-240 to decay to 12 grams.
How many grams of radium-222 remain in a 12-gram sample after 76 seconds?
After 76 seconds, half of the radium-222 would have decayed (its half-life is about 3.8 days). Therefore, the quantity of radium-222 remaining in the 12-gram sample would be 6 grams.
How much of one gram of radium-226 will remain unchanged after four half-lives?
After each half-life, half of the radium-226 will decay. Therefore, after four half-lives, 1/2^4 or 1/16th of the original gram of radium-226 will remain unchanged. This means that 1/16th of a gram, or 0.0625 grams, will still be unchanged after four half-lives.
How many moles in 500 grams of radium?
To find the number of moles in 500 grams of radium (Ra), you need to divide the given mass by the molar mass of radium. The molar mass of radium is approximately 226 grams/mol, so 500 grams of radium is equal to 500 grams / 226 grams/mol ≈ 2.21 moles of radium.
How many milligrams of a 15.0 mg sample of radium-226 remain after 6396 years if the half-life of radium-226 is 1599?
One sixteenth of a gram. 1st halflife- 1/2 gram 2nd, 1/4 3rd 1/8th 4th halflife, 1/16th
How much of an 800-gram sample of potassium-40 will remain after 3.9109 years of radioactive decay?
100 grams
How long does it take a 5-gram sample of uranium- 235 to decay to a mass of 2.5 grams?
One Half-Life :-)
How much of an 800-gram sample of potassium-40 will remain after 3.9 X 109 years of radioactive decay?
100 grams
How old is a sample of granite that contains 8 grams of radioactive potassium-40 and 56 grams of its nonradioactive decay products?
Based on the ratio of 8 grams of radioactive potassium-40 to 56 grams of its nonradioactive decay products, we can infer that half of the initial potassium-40 has decayed. Since the half-life of potassium-40 is about 1.25 billion years, we can estimate the age of the sample to be around 1.25 billion years.
How much of a 100 gram sample would remain unchanged after 2 hours?
To determine how much of a 100 gram sample would remain unchanged after 2 hours, it is necessary to know the specific decay rate or change process of the sample. For example, if the sample undergoes a decay process with a known half-life, you can calculate the remaining amount using the formula for exponential decay. Without this information, it's impossible to provide an exact answer. In general, if no decay occurs, the entire 100 grams would remain unchanged.
What is the half life of a radioactive isotope if it takes 6.2 days for a 72 gram sample to decay to 18grams?
18 grams are one fourth of the original sample mass of 72 grams. Accordingly, the half life is 6.2/4 = 1.55 days.
How Many Halflife Are These In A 100-year Span How Many Grams Of The Sample Would Remain At The End Of The 100 Years?
If the substance has a half-life of 10 years, there would be 10 half-lives in a 100-year span. Each half-life reduces the amount by half, so after 100 years, 1/2^10 = 1/1024 grams of the sample would remain.
How long will it take 24 grams of plutonium -240 to Decay to 20 gram?
The half-life of plutonium-240 is about 6,560 years. If 24 grams decay to 20 grams, it represents a loss of 4 grams of plutonium. The time it would take for 24 grams to decay to 20 grams would depend on the specific decay rate and is typically calculated using exponential decay equations.
