Thermodynamics ...

For the reaction of one mole zinc dust with one mole sulphuric acid in a bomb calorimeter, $$\triangle U$$ and w correspond to?

For $$ { Zn }^{ 2+ }/Zn $$ ,
$$ { E }^{ \circ  }=-0.76\quad V $$,
for $$ { Ag }^{ + }/Ag\quad { E }^{ \circ  }=\quad 0.799\quad V $$.
The correct statement is:

Suppose that a reaction has $$\Delta H=40\ kJ$$ and $$\Delta S=50\ kJ/ K$$. At what temperature range will it change from spontaneous to non-spontaneous?

Two liquids are at $$40^oC$$  and $$30^oC.$$ When they are mixed in equal masses , the temperature of the mixture is $$36^oC.$$ Ratio of their specific heats is 

The value closest to the thermal velocity of a Helium atom at room temperature (300 K) in $$ms^{-1}$$ is : [$$k_B = 1.4 \times 10^{-23} \ J/K ; \ m_{He} = 7\times 10^{-27} \ kg$$ ]

For the reaction; $${ FeCO }_{ 3(s) }\longrightarrow { Fe }O_{ (s) }+C{ O }_{ 2 }(g)$$, $$\Delta H=82.8\ kJ$$ at $${ 25 }^{ 0 }C$$. What is $$\Delta U$$ at $${ 25 }^{ 0 }C$$?

For a reaction to occur spontaneously:

$$\Delta S $$ for $$4Fe_(s)+3O_{2(g)}\rightarrow 2Fe_2O_{3(s)}$$ is $$550J/mol/K$$. The process is found to be spontaneous even at $$298K$$ $$[\Delta H=-1650kJ]$$

The incorrect criterion for the spontaneity of a process is:

$$0.1 \,{m^3}$$ of water at $${80^ \circ }$$ is mixed with $$0.3 {m^3}$$ of water at $${60^ \circ }$$. The final temperature of mixture is :