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Writing and Reading a Chemical Equations

If heat or so...

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If heat or some other gas is evolved(exothermic reaction), then it is denoted by an upward arrow in a chemical equation. In the same way, if heat is absorbed (endothermic reaction) by the reactants, then by which symbol is this denoted?

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Q. Heat of a reaction is defined as the amount of heat absorbed or evolved at a given temperature when the reactants have combined to form the products is represented by balanced chemical equation. If the heat is denoted by

q

then the numerical value of

q

depends on the manner in which
the reaction is performed for two methods of conducting chemical reactions in calorimeters.

The heat of combustion of maltose at a constant volume in the above question if water vapour is not condensed will be:

Q. Heat of a reaction is defined as the amount of heat absorbed or evolved at a given temperature when the reactants have combined to form the products is represented by balanced chemical equation. If the heat is denoted by

q

then the numerical value of

q

depends on the manner in which
the reaction is performed for two methods of conducting chemical reactions in calorimeters.

The heat capacity of a bomb calorimeter is 300 J/K. When 0.16 gm of methane was burnt in this calorimeter, the temperature rose by

3^{\circ} C

Δ U

per mole will be:

Q. Heat of a reaction is defined as the amount of heat absorbed or evolved at a given temperature when the reactants have combined to form the products is represented by balanced chemical equation. If the heat is denoted by

q

then the numerical value of

q

depends on the manner in which
the reaction is performed for two methods of conducting chemical reactions in calorimeters.

The heat capacity of a bomb calorimeter is 300 J/K. When 0.16 gm of methane was burnt in this calorimeter, the temperature rose by

3^{\circ} C

Δ U

per mole will be:

Q. Heat of a reaction is defined as the amount of heat absorbed or evolved at a given temperature when the reactants have combined to form the products is represented by balanced chemical equation. If the heat is denoted by

q

then the numerical value of

q

depends on the manner in which
the reaction is performed for two methods of conducting chemical reactions in calorimeters.

When maltose

C_{12} H_{22} O_{11} (s)

burns in a calorimetric bomb at 298 K yielding carbon dioxide and water, the heat of combustion is

- 1350 kcal/mol

, the heat of combustion of maltose at constant
pressure will be:

Q. Assertion :Chemical reactions in which heat is released along with the formation of products are called exothermic reactions. Reason: Chemical reactions that absorb energy or require energy to proceed, are called endothermic reactions.

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