Westonci.ca is your trusted source for accurate answers to all your questions. Join our community and start learning today! Discover in-depth answers to your questions from a wide network of professionals on our user-friendly Q&A platform. Get quick and reliable solutions to your questions from a community of experienced experts on our platform.

A chemist carefully measures the amount of heat needed to raise the temperature of a 1.05 kg sample of a pure substance from 1.9 °C to 19.7 °C. The
experiment shows that 4.39 kJ of heat are needed. What can the chemist report for the specific heat capacity of the substance? Be sure your answer has the
correct number of significant digits.
х
?


Sagot :

  • Mass=m=1.05kg
  • initial temperature=1.9°C
  • Final temperature=19.7°C
  • ∆T=19.7-19.7=17.8°C
  • Heat=Q=4.39KJ=4390J

Now

[tex]\\ \sf\longmapsto Q=mc\Delta T[/tex]

[tex]\\ \sf\longmapsto c=\dfrac{Q}{m\Delta T}[/tex]

[tex]\\ \sf\longmapsto c=\dfrac{4390}{1.95(17.8)}[/tex]

[tex]\\ \sf\longmapsto c=\dfrac{4390}{18.69}[/tex]

[tex]\\ \sf\longmapsto c=234.8J/kg°C[/tex]