anonymous
  • anonymous
URGENT PLEASE !! What is the mass, in grams, of a sample of 6.98 × 10^24 atoms of magnesium (Mg)? Show your work or explain the steps that you used to determine your answer.
Chemistry
schrodinger
  • schrodinger
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anonymous
  • anonymous
dan815
  • dan815
you know the mass it says for Mg on the periodic table?
anonymous
  • anonymous
No.. I dont really know anything about this. Im not good at chemistry. I just started the course.

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anonymous
  • anonymous
find out how many atoms are in 1 mole of Mg, than convert that into grams
anonymous
  • anonymous
Ex - Hydrogen has an atomic mass of 1.008, and therefore 1.008 moles of Hydrogen has 6.022 *10^22 atoms
anonymous
  • anonymous
** If I remember correctly
anonymous
  • anonymous
Atomic mass if slightly different dependent on your periodic table (google says something slightly different than your table usually does - usually with more sig figs)
anonymous
  • anonymous
Lets say you have 3.45*10^24 atoms of hydrogen - how many grams is that?
anonymous
  • anonymous
does 6.98 x 10^24 = 28.2 g
anonymous
  • anonymous
\[3.45*10^{24} atoms \times \frac{ 1 mole H }{ 6.022*10^{24} atoms } \times \frac{ 1.008g }{ 1mole H }\]
anonymous
  • anonymous
was does it say the weight it for Mg?
anonymous
  • anonymous
*it should be 6.022*10^23
anonymous
  • anonymous
I need to leave - I need to continue studying botany. If my math was wrong - I'm sure someone will say something.
anonymous
  • anonymous
*math was for my example only

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