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:

⇒  

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles