Chemistry thermodynamics problem?

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Lucy

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Given that So = 147.5 J/(mol•K) for RO2(g), So = 205.0 J/(mol•K) for O2(g) and So = 158.2 J/(mol•K) for RO3(g) at 25oC. What is the standard change in entropy (J/K) at 25oC for the reaction below ?
2 RO2(g) + O2(g) 2 RO3(g)


I'd really appreciate any help! Thank you!
 
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