Average #160;atomic #160;mass #160;= #160;x1M1 #160;+ #160;x2M2x1 #160;+ #160;x2Where #160;x1 #160;and #160;x2 #160;are #160;the #16 ...

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Carbon

Silicon has 9...

Question

Silicon has 92.2 % S - 28, 4.690 is Silicon 29 and the rest is Silicon 30. Calculate the average atomic mass?

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Solution

$A v e r a g e a t o m i c m a s s = \frac{x_{1} M_{1} + x_{2} M_{2}}{x_{1} + x_{2}} W h e r e x_{1} a n d x_{2} a r e t h e % a b u n d a n c e a n d M_{1} a n d M_{2} a r e t h e m o l a r m a s s A v e r a g e a t o m i c m a s s = \frac{0.922 \times 28 + 0.04690 \times 29}{0.922 + 0.0469} = 28.05$

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