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In a calorimeter, a 1.0 g sample of magnesium is burned to form mgo. in doing so, 25.5 kj of energy are released. what is the molar enthalpy of combustion in kj/mol of magnesium?

question 2 options:

0.6324


1.54 x 1025

0.0392


620


25.5

Sagot :

The molar enthalpy of combustion in kj/mol of magnesium is 620 kj/mol, Option D is the correct answer.

What is enthalpy of Combustion ?

The energy released when a fuel is oxidized by an oxidizing agent is called enthalpy of Combustion.

It is given that

a 1.0 g sample of magnesium is burned to form MgO. in doing so, 25.5 kj of energy are released.

Molecular weight of Magnesium = 24.35g

24.35 g makes 1 mole of Mg

1g = 1/24.35

For 0.04 moles  25.5 kJ is released

for 1 mole 25.5 *1/.04

= 620 kj/mol

Therefore the molar enthalpy of combustion in kj/mol of magnesium is 620 kj/mol.

To know more about enthalpy of combustion

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