Home
Class 12
CHEMISTRY
At a particular temperature and pressure...

At a particular temperature and pressure, the heat produced in the formation of 2 mol of `C_(2)H_(6)(g)` from the reaction between `C_(2)H_(2)(g)` and `H_(2)(g)` is 626 kJ. What amount of `H_(2)(g)` will react with the required amount of `C_(2)H_(2)(g)` to produce 939 kJ of heat at the same temperature and pressure?

Text Solution

Verified by Experts

The thermochemical equation for the formation of 2 mol of `C_(2)H_(6)(g)` from the reaction between `C_(2)H_(2)(g)` and `H_(2)(g)` is:
`2C_(2)H_(2)(g)+4H_(2)(g) to 2C_(2)H_(6)(g),Deltah=-626kJ`
`therefore` 626kJ of heat`-=4` mol `H_(2)(g)`
`therefore939kJ` of heat `-=(4)/(626)xx939-=6mol" "H_(2)(g)`
`-=6xx2-=12g" "H_(2)(g)`
Therefore, if 12g `H_(2)(g)` reacts with the required amount of `C_(2)H_(2)(g)` to produce `C_(2)H_(6)(g)`, then 939 kJ the heat is evolved.
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL THERMODYNAMICS

    CHHAYA PUBLICATION|Exercise WARM UP EXERCISE|119 Videos

  • CHEMICAL THERMODYNAMICS

    CHHAYA PUBLICATION|Exercise QUESTION ANSWER ZONE FOR BOARD EXAMINATION (VERY SHORT ANSWER TYPE)|26 Videos

  • CHEMICAL KINETICS

    CHHAYA PUBLICATION|Exercise EXERCISE (NUMERICAL PROBLEMS)|37 Videos

  • CHEMISTRY IN EVERYDAY LIFE

    CHHAYA PUBLICATION|Exercise PRACTICE SET 15|15 Videos

Similar Questions

Explore conceptually related problems

Write down the relation between K_(p) and K_(c) of the reaction H_(2) (g) + I_(2) (g) hArr 2 HI(g)

At 25^(@)C, K_(c ) for the reaction 3C_(2)H_(2(g))hArr C_(6)H_(6(g)) is 4.0. If the equilibrium concentration of C_(2)H_(2) is 0.5 mol. lit^(-1) . What is the concentration of C_(6)H_(6) ?

At a particular temperature and pressure, N_(2)(g) and O_(2)(g) react to form 4 mol of N_(2)O . The heat oabsorbed in this reaction is 328 kJ. What will be change in enthalpy be due to the formation of 2 mol of N_(2)(g) and 1 mol of O_(2)(g) from N_(2)O(g) at the same temperature and pressure?

The enthalpy of formation of ammonia is x KJ mol^(-1) . The enthalpy of the reaction 2N_2(g)+6H_2(g) rarr 4NH_3(g)

Find the relation betweenn K_(p)&K_(c) for the given reactions: C(s)+H_(2)O(g)hArrCO(g)+H_(2)(g)

At constant temperature & high pressure, the given reaction is of the zero order : 2NH_(3)(g)overset(pt)rarrN_(2)(g)+3H_(2)(g) . If the rate constant of this reaction is 3xx10^(-4)"mol.L"^(-1).s^(-1) , calculate the rate of formation of N_(2)and H_(2) .

At 25^(@)C , heat evolved due to complete combustion of 7.8 g of C_(6)H_(6)(l) is 326.4 kJ. Calculate the heat evolved due to complete combustion of the same amount of C_(6)H_(6)(l) at the same temperature and constant pressure of 1 atm.

Molar heats of combustion of C_(2)H_(2)(g), C (graphite) and H_(2)(g) " are " -310.62 " kcal ", -94.05 " kcal " and -68.32 kcal respectively. Calculate the standard heat of formation of C_(2)H_(2)(g) .

At a particular temperature and pressure, the volume of 12 g of H_2 gas is 134.5 L. what will be the final volume of the gas if 4 g of H_(2) gas is added to it at the same temperature and pressure?