Exercise 20.66 - Enhanced - with Feedback and Hints MISSED THIS? Read Section 20.5 (Pages 913 - 917); Watch KCV 20.5, IWE 20.6. Use tabulated half-cell potentials to calculate AGixn for each of the following reactions at 25 °C YO Part A 2FE3+(aq) + 3Sn(s) → 2Fe(s) + 3Sn²+(aq) Express the energy change in kilojoules to two significant figures. > View Available Hint(s) V ΑΣφ AG: %3D Ixn kJ II

1. How much heat, in joules and in calories, must be added to a 75.3 g chromium block with a specific heat of 0.450 J/g·°C to increase its temperature from 25°C to its melting temperature of 1907°C?  J  =  cal = 2. A piece of unknown substance weighs 45.9 g and requires 2730 J to increase its temperature from 23.1°C to 88.9°C. (a) What is the specific heat (in J/g·°C) of the substance?  J/g·°C (b) If it is one of the substances found in the table below, what is its likely identity? Specific Heats of Common Substances at 25°C and 1 bar Substance Symbol (state) Specific Heat (J/g·°C) gold Au(s) 0.129 copper Cu(s) 0.384 iron Fe(s) 0.449 argon Ar(g) 0.521 silicon Si(s) 0.712 carbon dioxide CO2(g) 0.843 aluminum Al(s) 0.904 nitrogen N2(g) 1.039 water H2O(l) 4.1801 helium He(g) 5.196

The following information is given for antimony at latm: AHvap (1440.00°C) = 1.605 x 10° J/g AĦfus (631.00°C) = 161.1 J/g Th = 1440.00°C %3D %3D Tm = 631.00°C Specific heat solid = 0.2090 J/g °C Specific heat liquid = 0.2590 J/g °C A 31.40 g sample of liquid antimony at 738.00°C is poured into a mold and allowed to cool to 22.00°C. How many kJ of energy are released in this process? (Report the answer as a positive number.) Energy = kJ

A nuclear reactor for a local public electricity company produces about 4.7 x 1014 J on a particular day. What mass of matter (in grams) is converted into energy each time 4.7 x 1014 J?  Answers must be correct to +/- 0.02 grams.