1. Determine the enthalpy for this reaction:

2NaOH(s)+CO2(g) Na2CO3(s)+H2O(l)

2. Consider the reaction

Na2CO3(s)Na2O(s)+CO2(g)

with enthalpy of reaction

Hrxn=321.5kJ/mol

What is the enthalpy of formation of Na2O(s)?

Express your answer in kilojoules per mole to one decimal place.

Describe the difference between a "homolytic bond dissociation energy" and a "heterolytic bond dissociation energy". In most cases, for a given type of chemical bond, the homolytic bond dissociation energy is less than the heterolytic bond dissociation energy. Explain.

Determine the minimum concentration of the precipitating agent on the right to cause precipitation of the cation from the solution on the left.

A. 4.0×10⁻²M Ba(NO3)2;NaF
B. 8.5×10⁻²M CaI2;K2SO4
C. 1.8×10⁻³M AgNO3;RbCl

1. Determine the pH of the buffer solution that is prepared by mixing 259 mL of 0.0983 M BIS−TRIS propane−H (C11H27N2O6+ ) to 855 mL of 0.0729 M BIS-TRIS_propane (C11H26N2O6) ). Assume the 5% approximation is valid. Report your answer to 2 decimal places. The pKa of BIS−TRIS propane−H is 9.10. Submit Answer Tries 0/3 2. Determine the pH of the BIS−TRIS propane−H/BIS−TRIS propane buffer solution after the addition of 25.2 mL of 0.643 M solution of rubidium hydroxide to the existing buffer solution. Assume the 5% approximation is valid.

What are two most well-known "Bands" in traditional or classic (inorganic) semiconductors? For most organic materials, scientists typically do not use those " Bands" and instead using different but similar names, what are those name, and explain the differences and similarities between organics verus inorganic semiconductors inters of thoses names

Which of the following bonds would be the most polar? a. N--P b. N--Al c. N--Ga d. N--Si e. N--C

What is the pH of a saturated strontium hydroxide solution?

The pH gradient established by the electron transport chain in photosynthesis:

a.)  Exists between the matrix and the mitochondrial intermembrane space

b.)  Sets up a voltage gradient that drives GTP formation

c.)  Is established by electron transfer from FADH2 and NADPH from the TCA
cycle to oxygen

d.)  Occurs in part because Fe-S clusters can only transport electrons and not protons

e.)  None of the above 

All surface probe microscopy (SPM) techniques involve a probe which interacts with a sample surface. Atomic Force Microscopy (AFM) and Scanning Transmission Microscopy (STM) are two SPM techniques that operate on the basis of different fundamental principles, though they have many similar aspects. Describes the underlying principles of AFM and STM for measuring surfaces

The Sun delivers roughly 1 kW m−2 of power to the Earth's surface. A parabolic mirror with a 1 m radius is used to focus this energy onto a beaker containing 1 L of water. Estimate the time taken by the mirror to raise the temperature of the water by 50∘C, assuming the specific heat capacity of water to be 4200 J K−1 kg−1 and ignoring energy losses to the surroundings