<u>Answer:</u> The Henry's law constant for oxygen gas in water is 
<u>Explanation:</u>
To calculate the molar solubility, we use the equation given by Henry's law, which is:

where,
= Henry's constant = ?
= solubility of oxygen gas = 
= partial pressure of oxygen gas = 2.1 atm
Putting values in above equation, we get:

Hence, the Henry's law constant for oxygen gas in water is 
No but a chemical change yes a chemical property is only a characteristic not change
The ion in the cathode that gains electrons
Answer:
C. sorry if I'm wrong ...................
THe Answer is 105 J
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