steve816
  • steve816
I got a quick simple chemistry question and help would be awesome :) Calculate the number of atoms in a 2.76 x 10^3 g sample of calcium.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
baru
  • baru
u know mass number of calcium?
steve816
  • steve816
Yeah, the mass is 40.08 amu
baru
  • baru
calcium: 20 protons and 20 neutrons mass number: 40

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More answers

baru
  • baru
do you know avagadro's number?
steve816
  • steve816
6.022 x 10^23
baru
  • baru
40 gram of calcium contains 6.022 x 10^23 atoms can you tell how to find number of atoms in 1 gram?
steve816
  • steve816
Divide by 40?
baru
  • baru
yea 6.022 x 10^23/40 is the number of atoms in 1 gram of calcium so the number of atoms in 2.76 x 10^3 grams is?
steve816
  • steve816
So the avagadro's number is the amount in grams?
steve816
  • steve816
And also, is the amu in grams too?
baru
  • baru
u know how to proceed? no amu is a unit on its own. if mass number(protons +neutrons) of some element is M, then M grams of the substance contains "6.022 x 10^23" atoms in it.
steve816
  • steve816
Ohhh, okay.
steve816
  • steve816
So how would I enter it in my calculator?
baru
  • baru
you will have to do the 10^ stuff by hand
steve816
  • steve816
Help please? Not good with scientific notation :(
baru
  • baru
\[\frac{ 6.022 \times 10^{23} \times 2.76 \times 10^3 }{ 40 }\]
baru
  • baru
\[\frac{ 6.022 \times 2.76 \times (10^3\times 10^{23}) }{ 40 }\]
baru
  • baru
do everything outside the brackets by calculator
steve816
  • steve816
\[\frac{ 16.621 \times 10^{26}}{ 40 }\]
anonymous
  • anonymous
Good

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