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3 years ago

The activation energy of an endothermic reaction _____.

Chemistry

2 answers:

amm18123 years ago

8 0

Answer:

must be greater than the required ΔH

Explanation:

The activation energy is the minimum extra amount of energy required by reactant molecules to undergo a reaction.

For both exothermic and endothermic reactions we need activation energy.

Enthalpy is the energy difference between products and reactants.

For endothermic reactions, enthalpy is positive as the energy of products is more than the energy of reactants.

As activation energy will be greater than the energy of both the reactants and products, so it must be greater than the enthalpy of reaction.

Explanation:

Anon25 [30]3 years ago

3 0

Endothermic reactions are reactions that require heat in the course of the process. The heat of reaction in this case is positive which means the energy of the products is greater than the energy of the reactants. In this case, the answer to this problem would have to be <span>1. must be greater than the required ΔH </span>

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Ethylene glycol is used as an antifreeze in car. if 400 g of ethylene glycol is added to 4.00 kg of water, what is the molaity?

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Data:

solute: ethylene glicol => not ionization

molar mass of ethylene glicol (from internet) = 62.07 g/mol

solute = 400 g

solvent = water = 4.00 kg

m =?

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Kf = 1.86 °C/mol

Formulas:

m: number of moles of solute / kg of solvent

ΔTf = Kf*m

number of moles of solute = mass in grams / molar mass

Solution

number of moles of solute = 400 g / 62.07 g/mol = 6.44 moles

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The nearest noble gas which lies to Chlorine is Neon which has 10 electrons. Rest of the 7 electrons are filled in the 3s and 3p orbitals. Hence, the electronic configuration of Chlorine is

$[Cl]=[Ne]3s^23p^5$

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Answer:

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Answer:

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