What is the answer of this 2 problems? please need the answers of those... Safar

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What is the answer of this 2 problems? please need the answers of those...

Safari File Edit View History Bookmarks window Help west.cengagenow.com OWLv2 Online teaching and learning resource from Cengage Learning Specific Heats Home | Yahoo Answers Assignment 12 Energy Part 2 (Exam 3) Review Topics Stoichiometry 1 pts Use the References to access important values if needed for this question 2. Coffee Cup Calorimetry: Specific... 1 pts 2req In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to detcrmine the specific heat capacity of a solid, or to measure the enthalpy change of a solution phase reaction. Thenmometer Question Question A student heats 64.24 g iron to 99.10 °C and carefully lowers it into a cup containing 84 62 g water at 20.62 °C. She measures the final temperature to be 26.26 °C 3. Coffee Cup Calorimetry: Solution... 1 pts 2req 4. Manipulating Thermochemical E... 1pts 2req 1 pts 2req The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.56 J/°C. 5. Hess's Law: Two Reactions Assuming that there is no heating of the surroundings calculate the specific heat capacity of ironMt ample 6. Formation Enthalpy: ReactionE... 1 pts 2req 7. Formation Enthalpy: Calculate fr... 1 pts 2req 8. Thermochemical Expressions: A 1 pts 2req Specific Heat (Fe) - Submit Answer Retry Entire Group 4 more group attempts remaining Progress: 1/8 groups Due Nov 19 at 10:50 PM Next Previous 18

Explanation / Answer

-Qiron = Qsurroundings

-m*C*(Tf-Tiron) = m*Cpw*(tf-Twater) + Ccal * (Tf-Twater)

-64.24*Ciron*(26.26-99.10) = 84.62*4.184*(26.26-20.62) + 1.56*(26.26-20.62)

Ciron = 2005.64 / (64.24 * -(26.26-99.10) )  

Ciron = 0.42862 J/gC

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