The measured half-life of a 1st order irreversible reaction depends on when you

Question

The measured half-life of a 1st order irreversible reaction depends on when you started measuring. The work done by the system in an isothermal reversible expansion equals the amount of heat absorbed by the system. The heat absorbed in an adiabatic expansion is zero. Cp = Cv + R is exactly true for one mole of an ideal gas. The work done expanding against t a calcium is zero unde all conditions, assuming only expansion work is possible. The entropy of a system increases in any spontaneous process. At the triple point of water, the chemical potentials of solid, liquid and gaseous water are all equal The chemical potential of a liquid decreases when a solute is added Raoult's law predicts that the partial pressure of a volatile component A above a liquid mixture is proportional to the mole fraction of A in the liquid The maximum number of phases that can simultaneously coexist in a mixture having two components is four.

Explanation / Answer

1. False, t1/2 = 0.693/k which is a constant.

2. False, in an isothermal reveresible process dT=0,

3. True, in this process the system is insulated to stop heat transfer.

4. True, for 1 mole of gas PV=RT differentiate with T to get the result,

6. True, the entropy of universe is always incresing and Suniverse = Ssurrounding+ Ssystem

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