Thermodynamics ...

Mark the point where the temperature of $$H_2O$$ is changing at $$4.18 J/g^o$$C(or $$1$$ $$cal/g^oC$$)?

According to Hess's law, the heat of reaction depends upon

If $$C+{O}_{2}.\longrightarrow  {CO}_{2}+94.2kcal$$
$${H}_{2}+\cfrac{1}{2}{O}_{2}\longrightarrow  {H}_{2}+68.3kcal$$
$${CH}_{4}+2{O}_{2}\longrightarrow  {CO}_{2}+2{H}_{2}O+210.8kcal$$
Then, the heat of formation of methane will be

10 g of liquid at 300K is heated to 350 K. The liquid absorbs 6 kcals. What is the specific heat of the liquid (in $$cal/ \displaystyle { g }^{ \circ  }C$$)?

Statement I
As ice absorbs heat and begins to melt, its temperature remains constant
Because
Statement II
Changes of state bring about changes in a substances potential energy, not in its kinetic energy

If 100.0 J of energy is added to 50.0 g of Cu, initially at $$25.0^o C$$, what will be the final temperature? (Specific heat capacity = 0.382 J/ C.g )

Two substances P and Q when brought together, form substance R with the evolution of heat. The properties of R are different from both P and Q. What is substance R?

Which statement is correct about heat?

Hess's Law is used

A spontaneous reaction occurs: