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anonymous

  • one year ago

Calculate the number of moles of helium that contains 3.25 x 10^21 atoms.

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  1. anonymous
    • one year ago
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    Without numbers, can you figure this out. Always start with given value \[\frac{ atoms}{ 1}\times \frac{ mol }{ atoms }\]

  2. anonymous
    • one year ago
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    3.25 x 10^ 21 atom x (1mol/6.022 x 10 23 atom)

  3. anonymous
    • one year ago
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    Right?

  4. anonymous
    • one year ago
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    \[3.25 x 10^{21} atom x \frac{ 1 mol }{ 6.022 x 10^{23} atom }\]

  5. anonymous
    • one year ago
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    Yes, that is right. Sorry I was helping someone.

  6. anonymous
    • one year ago
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    And I get .539687811

  7. anonymous
    • one year ago
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    Units would be in moles of helium.

  8. anonymous
    • one year ago
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    So .539687811 mol He?

  9. anonymous
    • one year ago
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    It has to be 3 sf since the given value only has 3. Remember that your answer has a 0 in the front. It does not count as a sf.

  10. anonymous
    • one year ago
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    .540 mol He?

  11. anonymous
    • one year ago
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    Yes Nice rounding!

  12. anonymous
    • one year ago
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    Thanks

  13. anonymous
    • one year ago
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    No problem!

  14. anonymous
    • one year ago
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    It's saying the answer is wrong. I did it right...Right?

  15. anonymous
    • one year ago
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    I did not do the calculations since you got the right conversion. You did the calculation. Do the calculation again.

  16. anonymous
    • one year ago
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    I think you put 3.25*10^23 instead of 3.25*10^21

  17. anonymous
    • one year ago
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    I did it again and got the same answer.

  18. anonymous
    • one year ago
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    Write down what you calculate then.

  19. anonymous
    • one year ago
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    \[3.25\times10^{21} atomtimes \frac{ 1mol }{ 6.022 \times10^{23 } }atom\]

  20. anonymous
    • one year ago
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    3.25 x 10^21 atom x

  21. anonymous
    • one year ago
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    Dont forget parentheses. (3.25*10^21)/(6.022*10^23)

  22. anonymous
    • one year ago
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    Right

  23. anonymous
    • one year ago
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    Got .00540 mol He

  24. anonymous
    • one year ago
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    So what did you do wrong earlier?

  25. anonymous
    • one year ago
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    Forgot parentheses or wrong exponent?

  26. anonymous
    • one year ago
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    I put it in the calculator without parentheses

  27. anonymous
    • one year ago
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    Another way is multiply 3.25*10^21 and lets called that x then multiply 6.023*10^23 and call that y. Then just do x/y if you arent comfortable with parentheses.

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