Im doing a lab report.  were suppose to find the heat of reaction and the enthalpy of reaction. I dont understand which formulas to use. in the attachment please explain these two formulas, why are there two different ones for qrxn??? which one do I use? Can you help me calculate that and enthalpy of reaction with the following information. mass of contents of calorimeter=46.02 moles of magnesium used= .006m change in temperature = 14.1 C calorimeter constant= 5.39J/C Mg+2HCL=MgCl2+H2 This is the balanced equation right?

Q: 1. A 5.000 g sample of methanol, CH,OH, was combusted in the presenmce of excess oxygen in a bomb…

A: The given data : The mass of methanol = 5.000 g The mass of water = 4000 g The initial temperature…

Q: Find the enthalpy of reaction in kJ/mol when 25mL of 1.0M NaOH combines with 25mL of 1.0M HCl in a…

A:

Q: Given the following data, calculate:  a) Volume of standard HCl used, (mL) b) Moles of H+ used,…

A: Calculation for Run 1 : a) volume of standard HCL used =(Final burette reading - initial burette…

Q: Consider the following balanced reacti 2 A2 + 3B -C2 +2 D What is the enthalpy of reaction if the…

A: Given data Compound Standard enthalpy of formation ∆Hf° (KJ/mole) A2 13.78 B -19.81 C2 0.00…

Q: Using the AH-49.5 kJ/mmol, calculate the enthalpy change if you neutralized six moles of HCI with an…

A: Given  ΔH = - 49.5 kJ/mmol = - 49.5 x 10 3 kJ/mol Moles of NaOH =6 Moles of HCl = 6

Q: Is the total enthalpy (H) of the reactants more than or less than the total enthalpy of the products…

A:

Q: 9. (Calorimetry - Determination of enthalpy) A coffee-cup calorimeter having a heat capacity of 472…

A: Answer: This question is based on the conservation of energy where energy gained by the reaction…

Q: Determine the amount of heat (in kJ) given off when 1.26 X 10ʻ g of NO2 are produced according to…

A: The reaction given is 2 NO (g) + O2 (g) -------> 2 NO2 (g)                ΔH = -114.6 KJ/mol

Q: In this experiment, you used 45.0 ml. of 1.00 M HCI in each trial. Calculate the mass of Mg that…

A: Answer: This question is based on stoichiometric calculation where we have to calculate the moles Mg…

Q: The standard enthalpy of formation of liquid water AH,° is -285.9 kJ/mole. Write the balanced…

A: Given: The standard enthalpy of formation of liquid water is -285.9 KJ/mol.

Q: Given that: A(s) + B2(g) – AB2(g) AH = -242.3 kJ/mol A(s) + 3/2 B2(g) →AB3(g) AH = -319.1 kJ/mol…

A:

Q: For an exothermic reaction, how is the measured temperature change affected if some of the heat…

A: Consider that an exothermic reaction is taking place inside a calorimeter with water as its…

Q: a) Using standard enthalpies of formation (in Appendix G in your text), calculate the standard…

A: a. The enthalpy of reaction is given by: ∆Hrxn = ∑m∆Hproducts - ∑n∆Hreactants=  38×(∆HS8(g) ) +…

Q: The enthalpy change for the reaction of hydrogen gas with oxygen to produce water is -484 kJ for the…

A:

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.    

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.