These conversions are just killing me, I have a test on them tomorrow, if someone could explain the steps involved it would be much appreciated :) Will rate best answer, Thanks!
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First you need to find the mass percent composition of oxygen in glucose. Do this by dividing the mass of 6 oxygen atoms by the mass of a glucose molecule and multiply by 100 to get a percent.
Then, multiply 6 grams by the percent composition of oxygen to get the mass of oxygen in 6 grams of glucose. Remember that when multiplying by a percent, you need to turn it back into a regular number by dividing by 100, so 85% would be 0.85.
Next, divide the mass of oxygen in 6 grams of glucose (from the last step) by the molar mass of oxygen (16g/mol) to get the number of moles of oxygen in 6 grams of glucose.
Finally multiply the number of moles of O (from the previous step) by avogadros number, 6.022x10^23 to get the number of oxygen atoms in 6 grams of glucose.
*Avogadro's number is the number of "things" in a mole of "something" So in 1 mole of any element, there are 6.022x10^23 atoms.
EDIT: I made a mistake in my original answer in the second to last step, its fixed now.
Then, multiply 6 grams by the percent composition of oxygen to get the mass of oxygen in 6 grams of glucose. Remember that when multiplying by a percent, you need to turn it back into a regular number by dividing by 100, so 85% would be 0.85.
Next, divide the mass of oxygen in 6 grams of glucose (from the last step) by the molar mass of oxygen (16g/mol) to get the number of moles of oxygen in 6 grams of glucose.
Finally multiply the number of moles of O (from the previous step) by avogadros number, 6.022x10^23 to get the number of oxygen atoms in 6 grams of glucose.
*Avogadro's number is the number of "things" in a mole of "something" So in 1 mole of any element, there are 6.022x10^23 atoms.
EDIT: I made a mistake in my original answer in the second to last step, its fixed now.
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Quick math is 1.204 X 10^23 atoms of Oxygen :)
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