In a calorimeter, you combine 60 ml of a 0.983 m hno3 solution with 40 ml of a 1.842 m naoh solution. the reaction releases 3.2439 kj of heat. what is the standard molar enthalpy of neutralization for this reaction (kj/mol)?

60.094 kJ/mol is the standard molar enthalpy of neutralization for this reaction.

Explanation:

Moles of nitric acid  = n

Volume of nitric  solution = 60 mL = 0.060 L

Molarity of the hydrogen peroxide = 0.983 M

Moles of sodium hydroxide  = n'

Volume of sodium hydroxide solution = 40.0 mL = 0.040 L

Molarity of the sodium hydroxide= 1.842 M

As we can see that moles of sodium hydroxide are in excessive amount and moles of nitric acid are in limiting amount.So, enthalpy of reaction will be calculated with respect to the moles of nitric acid .

Energy released on the reaction for the given amount of acid and base = Q

Q = 3.2439 kJ

0.05898 moles of nitric acid gives 3.2439 kJ of energy.

Energy release when 1 mol of nitric acid reacts:

60.094 kJ/mol is the standard molar enthalpy of neutralization for this reaction.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.