Find the enthalpy change per mole of sodium when sodium reacts with water. 8 grams of sodium reacts with 227 cm3 of water, producing a temperature change from 298 K to 308.4 K. The specific heat capacity of water is 4.18 J/K g. A. -28.36 kJ B. 9868.1 J C. 62.75 kJ D. -28356.7 kJ

The correct answer to the following question will be Option A (-28.36 KJ). The further explanation is given below.

Explanation:

The given values are:

Sodium's mass = 8 grams

Water's volume = 227 cm³

Molar mass = 23 g/mol

Density of water = 1 g/cm³

Specific heat capacity () = 4.18 J/Kg

As we know,

⇒  

On putting the estimated values, we get

⇒                        

⇒                        

Now, Water's mass will be:

⇒  

Change in temperature will be:

⇒  

Heat released will be:

⇒  

On substituting the estimated values, we get

So that the change in the solution of Na will be:

⇒  

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