8636
Thermogravimetry experiments performed in a wide range of H ( 2 ) S and H ( 2 ) O partial pressures have shown that the ZnO sulfidation reaction rate has a nonlinear variation with H ( 2 ) S partial pressure at the same time no significant influence of water vapor on reaction kinetics has been observed .
 H ( 2 ) S, H ( 2 ) O, ZnO, H ( 2 ) S
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 H ( 2 ) S, H ( 2 ) O, ZnO, H ( 2 ) S