Hydrogen gas and oxygen gas release 482.6 kJ of heat when they combine to form steam....

Hydrogen gas and oxygen gas release 482.6 kJ of heat when they combine to form steam. Is this reaction endothermic or exothermic? In which direction does heat transfer (between system and the surroundings) for this reaction? Is deltaH for this reaction positive or negative?

Expert Solution

exothermic reactions are those where the product is having less energy than reactant's energy. that means the product is more stable than the reactants.

endothermic reactions are those where the product is having more energy than reactant's energy. that means the product is less stable than the reactants and has absorbed energy.

exothermic reactions release energy. thus above-given reaction is exothermic in nature

heat transfer is from system to surrounding

H is a measure of energy being used or lost. is energy is lost/ released, then H is negative.

if energy is used/ absorbed, then H is positive.

queen_honey_blossom answered 2 years ago

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