Answer all The heat of reaction (Delta H) is the amount of heat absorbed or rele

Question

Answer all The heat of reaction (Delta H) is the amount of heat absorbed or released during a reaction at constant pressure. This is also referred to as _________. exothermic endothermic the enthalpy change of the reaction the temperature of the reaction the potential energy of the reaction. If the sign of Delta H is (-) this indicates an _________. endothermic reaction and heat is released. endothermic reaction and heat is absorbed. exothermic reaction and heat is absorbed. exothermic reaction and heat is released. explosion is likely to occur. How many kJ are produced when 1 mole of H_2 (g) reacts with excess O_2 (g) in the following reaction? 2 H_2(g) + O_2(g) rightarrow 2 H_2O(l) + 572 kJ 572 kJ 446 kJ 1140 kJ 715 kJ 286 kJ How many kJ are produced when 50.0 g of oxygen reacts with excess H_2 (g)? 2 H_2(g) + O_2(g) rightarrow 2 H_2O(l) + 572 kJ 572 kJ 572 kJ 446 kJ 1140 kJ 715 kJ 286 kJ

Explanation / Answer

Hi,

3) The correct answer is option C

The enthalpy of change of reaction

as according to first law of thermodynamics dQ = dU + PdV

As H = U + PV
dH = dU + PdV + VdP
as pressure is constant VdP = 0 and  dU + PdV = dQ

therfore dH = dQ.

Sorry we are only allowed to answer one question at atime kindly repost the other questions individually

Thank you

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