Question

0). Calculate the no of nutroned in Img

Other Exams

Chemistry

Solution

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C14 has a molecular weight of 14 grams per mole. So that means that 7 milligrams would be ( 1 / 2 ) times ( 10^{wedge}-3 ) moles. A mole is ( 6.022 times 10^{wedge} 23 ) atoms, so this means we have ( 3.011 times 10^{wedge}-20 ) atoms of ( mathrm{C} 14 ) Now, we all know that carbon has 6 protons. That is what makes it carbon, as opposed to, say, nitrogen or boron. The 14 in ( mathrm{C} 14 ) means it has 14 protons and neutrons together in the nucleus. So, knowing we have 6 protons, we also know the remaining 8 are neutrons. So now we have ( 3.011 times 10^{wedge} 20 ) atoms ( x 8 ) neutrons per atom is ( 2.4 times 10^{wedge} 21 ) neutrons in total. That's a LOT of neutrons! (well they're really tiny so a lot fit into things but it's still something to wonder at).