Thermodynamics ...

A sample of liquid in a thermally insulated container (a calorimeter) is stirred for 2 hr by a mechanical linkage to a motor in the surrounding. For this process:

A certain amount of potassium chlorate on thermal decomposition gives oxygen which is sufficient for the combustion of ethane. When the products are cooled, the volume of the gaseous product is v ml. Identify the correct sequence of steps for the calculation of the mass of potassium chlorate
(a) Calculation of oxygen required for the combustion of ethane.
(b) Calculation of the amount of the ethane subjected to combustion from the volume of gaseous product.
(c) Calculation of potassium chlorate which can give the required amount of oxygen.
(d) Identification of the products of combustion of ethane and the product left after the cooling of products.

Calculate $${ \Delta H }/{ kJ }$$ for the following reaction using the listed standard enthalpy of reaction data:

The $$\Delta_f H^{ \ominus }$$ for $$CO_2(g), CO(g) and H_2O(g)$$ are $$-393.5, -110.5 and  -214.8  kJ  mol^{ -1 }$$, respectively. The standard enthalpy change $$(in kJ  mol^{ -1 })$$ for the reaction $$CO_2(g) + H_2(g)\longrightarrow CO(g) + H_2O(g)$$ is:

$$H_2(g) + \frac{ 1 }{ 2 }O_2(g)\longrightarrow 2H_2O(l);   \Delta H = -86  kJ$$
$$2H_2(g) + O_2(g)\longrightarrow 2H_2O(l)......... kJ(\pm?)$$

The temperature in K at which $$\displaystyle \Delta G=0$$, for a given reaction with $$\displaystyle \Delta H=-20.5\ kJ{ mol }^{ -1 }$$ and $$\displaystyle \Delta S=-50.0\ J{ K }^{ -1 }{ mol }^{ -1 }$$ is:

If 10 g of liquid at 300K is heated to 350 K, the liquid absorbs 6 kcals. Determine the specific heat of the liquid in cal/$$\displaystyle { g }^{ \circ  }C$$.

How much energy is released when $$6\ moles$$ of octane is burnt in air? Given $$\triangle H_{f}^{\circ}$$ for $$CO_{2} (g), H_{2}O(g)$$ and $$C_{8}H_{18} (l)$$ respectively are $$-490, -240$$ and $$+160\ J/mol$$