Answer:

Explanation:
Hello,
In this case, by using the ideal gas equation, we first compute the moles of oxygen at the given volume, pressure and temperature:

Then, since molar mass of gaseous oxygen is 32 g/mol, we compute the contained mass in grams as shown below:

Best regards.
Answer: The answer is A, A new element or different atom formed from the original two.
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-<em>TanqR</em>
Answer:
b. - 184 J/K
Explanation:
- ΔSsurr = - ΔH/T....at constant P and T.
∴ ΔHrxn = 54.2 KJ = 54200 J
∴ T = 25°C ≅ 298.15 K
⇒ ΔSsurr = - (54200 J)/(298 K)
⇒ ΔSsurr = - 182 J/K ≅ - 184 J/K