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1. How much heat is required to raise the temperature of 53 g of each of the following substances by 23 K? Substance A (C 8.37 J/g-K) Substance B 0.945 J/g-K) Substance C (C 0.0567 J/g-K) 5% 2. Determine the specific heat capacities (to 3 significant figures) of the mystery materials, assuming 200. g of a metal at 250.0°C is added to 200. g of waterát 20 C and given the final temperature of a. 37.89°C b.25.00°C с. 87.61°C 3. Determine whether each of the following processes are endothermic (absorbs energy) or exother- mic (releases energy). 5% a. evaporation of alcohol b. freezing of water to ice c. the glow of fireflies. 56.04 J/g. Based on this data, calculate 4. The freezing of benzene is exothermic with a Hweci the following (4 SF): a. The energy released when one mole of benzene (C,H) freezes. (5% b. The mass of liquid benzene that could be frozen by the release of 1.00 kJ.
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Answer #1

1) Mass of the substance A, m#53 g Specific heat of the substance A,s -8.37 J/g.K Change in temperature &T-23K Amount of heat absorbed by A, qA msAT #53 g 8.37-s(23K) g.K 1.0x10 J Mass of the substance B, m- 53 g Specific heat of the substance B,s 0.945 Jlg.K Change in temperature 23 K Amount of heat absorbed by B, qBmAT 53 g x 0.945 1.2 x103 J x (23K) g. K Mass of the substance C, m 53 Specific heat of the substance C,s0.0567 J/g.K change in temperature Δ1 = 2 K Amount of heat absorbed by C, qc -msAT -53 g 0,0567- -х (23K) g.K = 693

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