Asked by casey
How much energy is needed to heat and melt 3.0 kg of copper initially at 83°C?
Be mindful of significant figure rules for both multiplication and addition.
450 kcal
430 kcal
280 kcal
130 kcal
Be mindful of significant figure rules for both multiplication and addition.
450 kcal
430 kcal
280 kcal
130 kcal
Answers
Answered by
DrBob222
q1 = heat needed to raise T Cu from 83 C to it's melting point (you will look that up) is
q1 = mass Cu x specific heat Cu x (Tfinal-Tinitial) where Tf is the melting point and Ti is 83C.
q2 = heat needed to melt Cu at its melting point is
q2 = mass Cu x heat fusion
You will need to look up the heat fusion for Cu.
Then qtotal = q1 + q2
Post your work if you get stuck.
q1 = mass Cu x specific heat Cu x (Tfinal-Tinitial) where Tf is the melting point and Ti is 83C.
q2 = heat needed to melt Cu at its melting point is
q2 = mass Cu x heat fusion
You will need to look up the heat fusion for Cu.
Then qtotal = q1 + q2
Post your work if you get stuck.
Answered by
casey
ok, thank you. :)