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anonymous

  • one year ago

How much heat (kJ) is needed to raise the temperature of 100.0 grams of water from 25.0ºC to 50.0ºC?

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  1. anonymous
    • one year ago
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    Hello!

  2. anonymous
    • one year ago
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    I already worked the problem, however I seem to be a little confused with what the answer should be. I'll show you the steps.

  3. anonymous
    • one year ago
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    q= m * c * delta(T) q= 100 * 4.18 j/g º C * 50ºC - 25ºC q=10450

  4. anonymous
    • one year ago
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    q=mct Where q is heat transferred m is the gram of substance c is the specific heat capacity. For water is it 4.18J/g*K t is temperature in Kelvin. Formula for Kelvin is K=C+273.15

  5. anonymous
    • one year ago
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    My answer choices are this A) 10450 B) 0.598 C) 1.05 D) 10.5 E) none of the above

  6. anonymous
    • one year ago
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    T is temperature difference between the 2 Kelvins temperature

  7. anonymous
    • one year ago
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    Yep, you did it correctly!

  8. anonymous
    • one year ago
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    My issue is I'm not sure if i have to leave the answer as 10450 or do i have to make it according to the sig figs?

  9. anonymous
    • one year ago
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    for example the lowest sigfig is 3 so would i leave it as 10450 or 105?

  10. anonymous
    • one year ago
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    It would be 1.05 x 10^4 J You need to use scientific notation

  11. anonymous
    • one year ago
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    That makes it 3 sf also.

  12. anonymous
    • one year ago
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    Is it require for every answer to use scientific notation?

  13. anonymous
    • one year ago
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    No, only if lowest sf is lower than the whole number's sf Like lowest sf is 4 and answer is 102345.23 or 102345 It would be 1.023 x 10^5

  14. anonymous
    • one year ago
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    Okay so in my case i got the answer 10450. I need to get it to 3 sf because its the lowest in the problem. I would make it 1.045 but round it to 1.05 making it 1.05 x 10^4?

  15. anonymous
    • one year ago
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    To make it 3 sf, you round out the 5 to make it gone.

  16. anonymous
    • one year ago
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    Right. So my choices are these A) 10450 B) 0.598 C) 1.05 D) 10.5 E) none of the above

  17. anonymous
    • one year ago
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    would the answer be C?

  18. anonymous
    • one year ago
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    However there isn't a "x 10^4" or does it make it e?

  19. anonymous
    • one year ago
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    You need the scientific notation. So what do you think the answer is now?

  20. anonymous
    • one year ago
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    1.05 does not equal 10450 or 10500 but 1.05 x10^4 does.

  21. anonymous
    • one year ago
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    I think it's E

  22. anonymous
    • one year ago
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    Yes, it would be because the answers are not in correct sf.

  23. anonymous
    • one year ago
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    Thanks a lot!

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