For a sample of gas (assume it\'s ideal), what is true about G as temperature de

Question

For a sample of gas (assume it's ideal), what is true about G as temperature decreases? G decreases G increases G stays approximately the same O Cannot determine unless S is known O Cannot determine unless V is known For a sample of gas (assume it's ideal), what is true about G as pressure increases? O G increases G decreases O G stays approximately the same Cannot determine unless S is known Cannot determine unless V is known For a sample of liquid, what is true about G as pressure increases? G increases Cannot determine unless V is known G stays approximately the same G decreases Cannot determine unless S is known

Explanation / Answer

1. Assuming only temperature is decreasing, G increases as temperature decreases.

As, dG = dH - TdS

T decreases and dS also decreases which makes dG higher.

2. As pressure increases, entropy decreases (dS), thus G also increases.

3. Liquids are not greatly affected by changes in pressure, thus no change in entropy so G remains approximately the same.

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