Question 6: (1 point)3 23 20\"C? (Give the answer in You have 250 grams of ice a

Question

Question 6: (1 point)3 23 20"C? (Give the answer in You have 250 grams of ice at O"C. How much heat is required to melt it and raise the temperature to calories. You may use 1 caig-C and 80 calg for your constants) S2 estior Question 7: (1 point) 126 grams of an unknown metal at 99.1 C is placed in 225 grams of water which is initially at 22.20C. The wa gram aluminum cup with a specific heat of 0216 calgeC. The final temperature of the system 25.7 oc. what is the specifi the unknown metal, in caligoC? c heat of H Question 8:(1 point) I How much heat is needed to melt 125 kg of steel that is initially at its 23 °C? It melts at about 1808°C, its specific heat is 0.450 kJkg C and its heat of fusion is 237 kJkg. (Both of the constants depend upon the type of steel.) Record the answer in to the nearest whole kilojoule (Use the symbol of the unit kJ).

Explanation / Answer

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6.

Heat required to melt and raise the temperature to 20oC

Q=mLf+mCw(T2-T1)

Q=250*80 + 250*1*(20-0)

Q=25000 Calories

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