1. When C 2 H 4 (g) reacts with H 2 O(g) to form CH 3 CH 2 OH(g) , 45.6 kJ of en
ID: 901049 • Letter: 1
Question
1. When C2H4(g) reacts with H2O(g) to form CH3CH2OH(g) , 45.6 kJ of energy are evolved for each mole of C2H4(g) that reacts.
Write a balanced thermochemical equation for the reaction with an energy term in kJ as part of the equation. Note that the answer box for the energy term is case sensitive.
Use the SMALLEST INTEGER coefficients possible and put the energy term (including the units) in an appropriate box. If a box is not needed, leave it blank.
+ ______
2. When NO(g) reacts with H2(g) to form N2(g) and H2O(l) , 376 kJ of energy are evolved for each mole of NO(g) that reacts.
Write a balanced thermochemical equation for the reaction with an energy term in kJ as part of the equation. Note that the answer box for the energy term is case sensitive.
Use the SMALLEST INTEGER coefficients possible and put the energy term (including the units) in an appropriate box. If a box is not needed, leave it blank.
+_______
3. The following thermochemical equation is for the reaction of hydrogen(g) with oxygen(g) to form water(g).
How many grams of H2(g) would have to react to produce 65.8 kJ of energy?
_____grams
4. The following thermochemical equation is for the reaction of Fe3O4(s) with hydrogen(g) to form iron(s) and water(g).
When 75.5 grams of Fe3O4(s) react with excess hydrogen(g), ______ kJ of energy are _________(evolved or absorbed.)
Hint: An amount of energy is expressed as a positive number. The sign indicates whether the energy is absorbed or evolved.
+ ______
Explanation / Answer
1)
C2H4(g) + H2O(g) ..............> CH3CH2OH(g) +45.6 KJ
2)
NO(g) + H2(g) ................> N2(g) + H2O(g) + 376KJ
3) 484 kj of energy is given by 4 gms. of H2
65.8 kj of energy ...........?
= 65.8*4/484 = 0.544 gm of H2
4) Fe3O4(s) + 4H2(g).......>3Fe(s) + 4H2O(g) DH = 151 kJ
231.5 gm of Fe3o4 absorbed 151 kJ
75.5 gms of Fe3O4 .............?
= 49.25 kJ
49.25 kJ of energy absorbed
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