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Hi!
So there's this formula triangle which I can't do on here but which, put into an equation is: Mass (g) = RAM (Relative atomic mass of the element) x Number of Moles.
Now, you know the amount of calcium there is (173g), and, by checking a Periodic Table and finding Ca and the big number next to it, you know Calcium's RAM (40.08). From this, you can find the number of moles (and from there, you can find the number of atoms, I think) because..... Number of Moles = Mass (173g) / RAM (40.08)
Which gives you ~4.32 moles.There are6.02 x 1023 (Avocado's number or something :D) atoms in a mole, and as you
have ~4.32 moles, 4.32 x

6.02 x 1023 = 2.60064x1024

This might not be the easiest way, but it's the only one I could think of! Hope it helps!

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12y ago

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