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# This is the answer but i dont get why they put (45.8-Tf) instead of (Tf-45.8). shouldnt...

## Question

###### This is the answer but i dont get why they put (45.8-Tf) instead of (Tf-45.8). shouldnt...
this is the answer but i dont get why they put (45.8-Tf) instead of (Tf-45.8). shouldnt the format be (Tf-Ti)? like for the eqution on the other side of the = sign its (Tf-15.4) and its in the format of (Tf-Ti). help A 32.5 g cube of aluminum initially at 45.8 Celsius is submerged into 105.3g of water at 15.4 Celsius. What is the final temperture of both substances at thermal equilibrium Best Answer Sharlene J answered this lets tf be the final temperature you write that the energy lost by Al is equal to the amount of Energy gained by water formula E=m*Cs* (tf-ti) E (AI) = 32.5*0.903"(tf-45) E(w) = 105.3*4.18*(tf-15.4) You write that E(AI) = - E(w) 32.5*0.903*(45-tf) = 105.3*4.18*(tf-15.4) 29.3475(45-tf) = 440.154(tf-15.4) 1321.8525 -29.3475tf =-6778.3716+440.154tf 8100.1685=469.5015tf tf=17.250

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