A 100-mL sample of water is placed in a coffee cup calorimeter. When 1.0 g of an ionic solid is added, the temperature decreases from 21.5°C to 20.8°C as the solid dissolves. Which of the following is true for the dissolving of the solid?  Consider ΔΔG = ΔΔH- TΔΔS,  Group of answer choices A. ΔH > 0 B. ΔSsys <  0 C. ΔSuniv <  0 D. cannot determine with information provided E. ΔH < 0

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Chapter1: Chemical Foundations
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1. A 100-mL sample of water is placed in a coffee cup calorimeter. When 1.0 g of an ionic solid is added, the temperature decreases from 21.5°C to 20.8°C as the solid dissolves. Which of the following is true for the dissolving of the solid?  Consider

ΔΔG = ΔΔH- TΔΔS, 

Group of answer choices
A. Δ> 0
B. ΔSsys <  0
C. ΔSuniv <  0
D. cannot determine with information provided
E. ΔH < 0
 
 
2.
The standard molar free energies of formation of NO2(g) and N2O4(g) at 25°C are -51.84 and -98.28 kJ/mol, respectively. What is the value of Kp (in atm) for the reaction written as follows at 25°C?  ΔΔG° = ─RTlnK, R = 8.314 J/K
          2NO2 (g)  ↔↔N2O4 (g)
Group of answer choices
A. 1.37 × 108
B. 7.31 × 10-9
C. 8.84
D. 1.17 × 104
E. 0.113
 
3.
For the reaction
          CO2(g) + 2H2O(g) → CH4(g) + 2O2(g),          ΔH° = 803 kJ
which of the following will increase K?
Group of answer choices
A. increasing the volume of reaction vessel
B. all of these
C. decreasing the number of moles of methane
D. none of these
E. increasing the temperature of system
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