Priscilla A.

asked • 03/18/20

25 g of Mercury is heated from 25 C to 155C, and it absorbs 455J of energy. Calculate the specific heat /C ?

Measuring Heat Q=mc∆T

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A P. answered • 03/18/20

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Chemical engineer with 15+ years of chemistry teaching experience
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Q=mc∆T=mc(Tf-T0)

455J=25g*c*((155-25)degC)

c=0.14 J/gdegC

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A P.

tutor
I unfortunately can't search my question and a lot of these seem to disappear. Feel free to post it under here or to set up a call with me to discuss.
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03/18/20

Priscilla A.

What is the kinetic energy in joules of 850g motorcycle moving 61 m/s? Calculate the potential energy of the motorcycle when on a steep hill 40 meter high?
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03/18/20

A P.

tutor
KE=.5mv^2. Convert your mass (850g) to kg (0.850 kg). Velocity is 61 m/s, so that should be a plug and chug. U = mgh. Same mass as before, g = 9.81 m/s^2, h = 40 m. Again, plug and chug.
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03/18/20

Priscilla A.

thank you, I understand it now.
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03/18/20

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