Please check. If answers are not correct. could youdemonstrate how to solve. 1)
ID: 678743 • Letter: P
Question
Please check. If answers are not correct. could youdemonstrate how to solve. 1) Steam (500. grams) is cooled from 150 C to water at 50 C.What is the change in enthalphy? Use: specific heat of steam is 2.0J/gK; sp. heat of water is 4.184 J/gK; heat of vaporization ofwater is 2256 J/g; and jeat of fusion of water is 333 J/g. Ans:1 x 10 2 kJ.2) 10.0 grams of Al is heated from to 200. C and then droppedinto 500. grams of ethylene glycol at 25.0 C. What is the finaltemperature in K? 1. The sp. heat of Al is0.897 J/gK and the sp. heat of ethylene glycol is 2.39 J/gK. DO NOTput the answer into scientific notation.
Please check. If answers are not correct. could youdemonstrate how to solve. 1) Steam (500. grams) is cooled from 150 C to water at 50 C.What is the change in enthalphy? Use: specific heat of steam is 2.0J/gK; sp. heat of water is 4.184 J/gK; heat of vaporization ofwater is 2256 J/g; and jeat of fusion of water is 333 J/g. Ans:1 x 10 2 kJ.
2) 10.0 grams of Al is heated from to 200. C and then droppedinto 500. grams of ethylene glycol at 25.0 C. What is the finaltemperature in K? 1. The sp. heat of Al is0.897 J/gK and the sp. heat of ethylene glycol is 2.39 J/gK. DO NOTput the answer into scientific notation.
Explanation / Answer
I didnt get the same answers as you. Number 1 was close, Ithink you may have just converted into scientific notationsincorrectly. the answer is 1282.5 kJ so its actually 1.282x103 kJ If you didnt make that mistake let me knowand i can walk you through it Number 2 is not right qAl =-qethylene glycol mAlcAl(Tf-Ti)Al=-mEGcEG(Tf-Ti)EG (10g)(0.897J/gK)(Tf-473K)=-(500g)(2.39J/gK)(Tf-298K) 8.97Tf-4242.81=-1195Tf+356110 1203.97Tf=360352.81 Tf=299.3 K