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700 million years

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Eloise Upton

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Juliet Olson

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One Half-Life :-)

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700 million years

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One Half-Life :-)

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700 million

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Q: How long does it take a 5 gram sample of Uranium -235 to decay to a mass of 2.5 grams?
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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 long does it take a 100 gram sample of uranium 235 to decay to a mass of 50 gram?

700 million years


Uranium-235 has a half-life of 700 million years. how long does it take a 100-gram sample of uranium-235 to decay to a mass of 50 grams?

700 million (more exactly 703,8.106) years


How much of an 800-gram sample of potassium-40 will remain after 3.9109 years of radioactive decay?

100 grams


How much of an 800-gram sample of potassium-40 will remain after 3.9 X 109 years of radioactive decay?

100 grams


Gram of molar mass in uranium?

1 atom gram of natural uranium = 238,028 91 grams


How many grams of a 35 gram sample of radium will decay in 5000 years if the half-life of radium is 1602 years?

approx. 31 g.


How many moles are in the element uranium?

1 atom-gram of uranium = 238,02891 grams


Carbon-14 has a half-life of 5730 years. How long does it take a 200-gram sample of carbon-14 to decay to a mass of 100 grams?

5,730 years


Carbon-14 has a half-life of 5730 years. how long does it take a 200-gram sample of carbon-14 decay to a mass of 100 grams?

5,730 years


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.


What is the mass in gram of 0.500 mole of uranium?

The mass of o,5 mole of uranium is 119,014455 g.