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

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

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

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

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

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

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

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

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I think you mean entropy

For entropy to be positive solids should be turned into liquid or gases.

In gases

Moles of gaseous products > Moles of gaseous reactants

For reaction

1st reaction - Entropy is positive (moles of products > Reactants)

2nd reaction - Entropy is positive (solid is turned into gas)

3rd reaction - Entropy is negative (moles of products < reactants)

4th reaction - Entropy is negative (moles of products < reactants)

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So you want something that is more discorded.

So this is solids turning to liquids and liquids turning to gasses

or 1 mole of gas turning into two moles of gas ect.

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

Solids turning to gas so more disorder, positive delta S

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