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Which of the following reactions have a positive ΔSrxn? Check all that apply.

2A(g)+B(g)----->C(g)

A(g)+B(g)----->3C(g)

2A(g)+3B(g)----->4C(g)

2A(g)+B(s)------->3C(g)

pur-new-sol

2A+B = C

delta S is negative as 3 molecules combine to form 1.

A+B = 3C

delta S is positive as 2 molecules are poducing 3 molecules.

2A+3B= 4C

delta S is negative.

2A+B= 3C

the no. of molecules are remaining the same, but solid is turning into gas. so delta S is positive.

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