5. The AH⁰ for the reaction (Na2O(s) + SO3(g) → Na2SO4(g)) equal to: Na(s) + H₂O() → NaOH(s) + 1/2 H2(g) Na2SO4(s) + H₂O(l) → 2NaOH(s) + SO3(g) 2Na2O(s) + 2H2(g) → 4Na(s) + 2H₂O(l) AH° = -146 kJ AH° = +418 kJ AH° = +259 kJ A. -581 kJ B. -435 kJ C.+531 kJ D. 109 kJ 6. The amount of absorbed heat in the complete reaction of 15.0 grams of SiO₂ with excess carbon in the reaction below? AH° for the reaction is +624.7 kJ: SIO2 (s) + 3C(s) → SIC(s) + 2CO(g) C. 31.2 KJ A. 5.06 kJ B.156.2 KJ D. 366 kJ 7. Helium is collected over water at 25°C and 1.0 atm total pressure. What total volume of gas must be collected to obtain 4.08 g of helium? (At 25°C the vapor pressure of water is 380 torr.)? A. 5 x 104 mL B. 33.4 L C. 50 L D. (A and C) are true

5. The AH⁰ for the reaction (Na2O(s) + SO3(g) → Na2SO4(g)) equal to: Na(s) + H₂O() → NaOH(s) + 1/2 H2(g) Na2SO4(s) + H₂O(l) → 2NaOH(s) + SO3(g) 2Na2O(s) + 2H2(g) → 4Na(s) + 2H₂O(l) AH° = -146 kJ AH° = +418 kJ AH° = +259 kJ A. -581 kJ B. -435 kJ C.+531 kJ D. 109 kJ 6. The amount of absorbed heat in the complete reaction of 15.0 grams of SiO₂ with excess carbon in the reaction below? AH° for the reaction is +624.7 kJ: SIO2 (s) + 3C(s) → SIC(s) + 2CO(g) C. 31.2 KJ A. 5.06 kJ B.156.2 KJ D. 366 kJ 7. Helium is collected over water at 25°C and 1.0 atm total pressure. What total volume of gas must be collected to obtain 4.08 g of helium? (At 25°C the vapor pressure of water is 380 torr.)? A. 5 x 104 mL B. 33.4 L C. 50 L D. (A and C) are true

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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