When 2 moles of H2(g) react with O2(g) to fonn H2O(g) according to the following

Question

When 2 moles of H2(g) react with O2(g) to fonn H2O(g) according to the following equation. 484 kJ of energy arc evolved 2H2(g) + O2(g)rightarrow2H2O(g) Is this reaction endothermic or exothermic? What is the value of q? kJ When 2 moles of NHj(g) react with 02(g) to form N2O(g) and H2O(g) according to the following equation. 683 kJ of energy are evolved 2NH3(g) + 2O2 rightarrow N2O(g) + 3H2O(I) Is this reaction endothennic or exothermic? What is the value of q? In the laboratory a student finds that it takes 125 Joules to increase the temperature of 14.5 grains of solid diamond from 21.5 to 39.3 degrees Celsius. The specific heat of diamond she has measured is J/gdegreeC In the laboratory a student finds that it takes 19.8 Joules to increase the temperature of 11.4 grams of solid platiuun from 24.5 to 38.4 degrees Celsius. The specific heat of platiuiiiu she lias measured is J/gdegreeC.

Explanation / Answer

1. Exothermic reaction ( since energy is evolved)

q = 484 kJ

2. Exothermic reaction ( since energy is evolved)

q = 683 kJ

3. 0.484 J/g.C

4. 0.125 J/g.C

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