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How many atoms are lefr not decayed in a 500 atom sample after 60 minutes if the half life is 20 minutes?
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The atomic mass of an atom is the?
The atomic mass of an atom is the mass of 6.011 X 10^23 atoms of that element.
How much of radioactive substance remains after 15 hours if it's half life is 5 hours?
The half-life of a radioactive substance is the time that it takes for half of the atoms to decay. With a half-life of 10 days, half has decayed in this time. After 20 days, a further 10 days/another half life, a further half of the remainder has decayed, so 1/4 of the original material remains, 1/4 of 15g is 3.75 grams. This is the amount of original radioactive substance remaining, but it’s daughter isotope ( what the decay has produced ) is also present, so the original sample mass is effectively constant, especially in a sealed container. Even in an unsealed container, and assuming alpha ( helium nucleii) emission, a drop in mass per radioactive atom of 4 Atomic Mass units, compared with the original atom of, say 200 amu is only 2% mass decrease, less for heavier decaying nucleii.
What is the ratio of a polysaccharide?
One atom of carbon to wo atoms of hydrogen to onHH2o
What is the set ratio of h2o?
2 atoms of hydrogen to 1 atom of oxygen.
How many atoms are bonded to the central atom when the molecular geometry is T-shaped?
3
How many atom of a 1.0 mole sample of bismuth 214 will remain after 20 minutes?
After 20 minutes, half of the bismuth-214 atoms in the sample will have decayed, as bismuth-214 has a half-life of 19.9 minutes. This means that 0.5 moles of bismuth-214 atoms will remain in the sample after 20 minutes. Since 1 mole of a substance contains Avogadro's number of atoms (6.022 x 10^23), there will be 3.011 x 10^23 bismuth-214 atoms remaining in the sample after 20 minutes.
The actual mass of an atom of argon is is 6.63x10-24g How many atoms are in a 40.0-g sample of argon?
To find the number of argon atoms in a 40.0-g sample, you first need to calculate the number of moles of argon in the sample using the molar mass of argon (39.95 g/mol). Then, you can use Avogadro's number (6.022x10^23 atoms/mol) to determine the number of atoms in that many moles of argon.
How many C-13 atoms are present on average in a 13000-atom sample of carbon?
The natural abundance of carbon-13 is around 1.1%. Therefore, in a sample of 13,000 carbon atoms, there would be approximately 143 carbon-13 atoms on average.
A sample of nitric acid contains 50 HNO3 molecules How many oxygen atoms are in this sample?
In each nitric acid molecule (HNO3), there is one oxygen atom. So, in a sample containing 50 HNO3 molecules, there would be 50 oxygen atoms.
How many atoms does bohrium have?
Your question does not make sense. One sample of bohrium could have a certain amount of atoms, while another sample of bohrium may have a different number of atoms. You probably mean: How many protons does bohrium have? Although it is synthetic and radioactive, a bohrium atom can be retained for a few seconds. It then has 107 protons.
The half-life of a radioactive element is?
The time it takes for half of the atoms in a sample of a radioactive element to decay.
What does the formula indicate about the composition of a 1.0 gram sample of hydrogen sulfide?
All of the molecules are identical combinations of two hydrogen atoms and one sulfur atom.
Do chemical formulas show the total number of atoms in a sample of a compound?
Yes, chemical formulas show the number of atoms in a compound. Water is H2O -- two hydrogen atoms bonded to one oxygen atom. Carbon dioxide is CO2 -- one carbon and two oxygen atoms.
The way you express the time it takes for atoms in a radioactive substance to distintegrate is called?
The way you express the time it takes for atoms in a radioactive substance to disintegrate is called the "half-life." It is the measure of how long it takes for half of the radioactive atoms in a sample to decay.
What does half-life of a radioactive sample mean?
The half-life of a radioactive sample is the time it takes for half of the radioactive nuclei in the sample to decay. It is a characteristic property of each radioactive isotope and is used to predict the rate of decay of the sample. After each half-life, the amount of radioactive material remaining decreases by half.
Is H2O2 an atom?
No, H2O2 is not an atom; it is a molecule. H2O2, or hydrogen peroxide, is composed of two hydrogen atoms and two oxygen atoms bonded together. Each hydrogen atom is an individual atom, and each oxygen atom is an individual atom.
How many moles of P are there in a sample of P that contains 3.78E plus 24 atoms?
To find the number of moles of P in the sample, divide the number of atoms by Avogadro's number (6.022 x 10^23 atoms/mol). So, 3.78 x 10^24 atoms / 6.022 x 10^23 atoms/mol = approximately 6.29 moles of P in the sample.
