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The heat of a reaction is measured in a ...

The heat of a reaction is measured in a bomb calorimeter . This heat is equal to which thermodynamic quantity?

A

`DeltaE`

B

`DeltaG`

C

`DeltaH`

D

`DeltaS`

Text Solution

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The correct Answer is:
a
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Chemical reactions are invariably associated with the transfter of energy either in the form of heat or light. In the laboratory, heat changes in physical and chemical processes are measured with an instrument called calorimeter. Heat change in the process is calculated as {:(q = ms DeltaT,,s ="Specific heat"),(=cDeltaT,,c ="Heat capacity"):} Heat of reaction at constant volume is measured using bomb calorimeter. q_(V) = DeltaU = Internal energy change Heat of reaction at constant pressure is measured using simple or water calorimeter. q_(p) = DeltaH q_(p) = q_(V) +P DeltaV DeltaH = DeltaU +DeltanRT The heat capacity of a bomb calorimeter is 500 JK^(-1) . When 0.1g of methane was burnt in this calorimeter, the temperature rose by 2^(@)C . The value of DeltaU per mole will be

Chemical reactions are invariably associated with the transfter of energy either in the form of heat or light. In the laboratory, heat changes in physical and chemical processes are measured with an instrument called calorimeter. Heat change in the process is calculated as {:(q = ms DeltaT,,s ="Specific heat"),(=cDeltaT,,c ="Heat capacity"):} Heat of reaction at constant volume is measured using bomb calorimeter. q_(V) = DeltaU = Internal energy change Heat of reaction at constant pressure is measured using simple or water calorimeter. q_(p) = DeltaH q_(p) = q_(V) +P DeltaV DeltaH = DeltaU +DeltanRT The enthalpy of fusion of ice is 6.02 kJ mol^(-1) . The heat capacity of water is 4.18 J g^(-1)C^(-1) . What is the smallest number of ice cubes at 0^(@)C , each containing one molw of water, the are needed to cool 500g of liquid water from 20^(@)C to 0^(@)C ?

Knowledge Check

  • The heat measured for a reaction in a bomb calorimeter is

    A
    `Delta G`
    B
    `Delta H`
    C
    `Delta U`
    D
    ` P Delta V`

  • The heat measured for a reaction in a bomb calorimeter is

    A
    `Delta G`
    B
    `Delta H`
    C
    `Delta E`
    D
    `P Delta V`

  • The amount of heat measured for a reaction in a bomb calorimeter is

    A
    `DeltaG`
    B
    `DeltaH`
    C
    `DeltaE`
    D
    `PDeltaV`

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    Assertion. The heat of combustion found by using bomb calorimeter gives the value of internal energy change DeltaU and not enthalpy change DeltaH . Reason.In a closed vessl, DeltaU = DeltaH only if pressure inside the calorimeter remains constant.

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