Answer the following question. Show the answer on the screen provided. After uploading your exam, take the picture of your work and upload it to Exam 4 Solutions, Extra Credit, and Partial Credit assignment. Your work must reflect the answer provided here. NO CREDIT will be awarded for the answer without work shown. Standard Enthalpies of Formation, in kJ/mol ΔHof     ΔHof NO(g)       +90.25          NO2(g)      +33.2        NH3(g)     -45.9     N2O(g)        81.6   H2O(l)        -285.8         H2O(g)         -241.8 Use the properties of enthalpy as a state function (version of Hess’s law) and  data above to calculate the enthalpy change for the reaction (Hint: Do not forget about the coefficients):                                          6 NO2(g)  +  8 NH3(g)  =>  7 N2(g)  +  12 H2O(g)                      ΔH = ?  

Use the special form of Hess’s law and given ∆H°f of the reactants and products to calculate the heat for the reaction(∆H°rxn) of methane with oxygen :  CH4 (g)  +  2O2(g)   →  CO2(g) +2H2O(l) ∆H°f, methane(g) = -74.60 kJ/mol ∆H°f, water(l) = -285.8 kJ/mol ∆H°f, carbon dioxide(g) = -393.5 kJ/mol

A 25.00 mL sample of the sulfuric acid solution was titrated with 45.42 mL of a 0.9598 M solution of sodium hydroxide, NaOH. What is the molar concentration of the sulfuric acid, H2SO4? H2SO4(aq) + 2 NaOH(aq)   →  Na2SO4(aq) + 2 H2O(l)

How many protons, electrons, and neutrons (respectively) are in an atom of iodine-131?     

The following is an example of a physical change:

The following intermolecular forces exist between the particles in the aqueous solution of NaCl

Which substance in the liquid state has only dispersion forces and hydrogen bonding?

In which of the following substances the molecules will not have hydrogen bonding as their strongest intermolecular interaction? (Hint check the shape and polarity of the molecules)

The following can be used to measure the heat of combustion for an unknown sample?

If 0.500  mol of hydrogen gas completely reacted with 0.5000 mol of bromine gas at constant pressure, releasing 46.25 kJ of heat, which of the following thermochemical equations is correct?