General Chemistry Answers

Photosynthesis is the process of making food by which green plants and some

other organisms use sunlight to synthesize foods from carbon dioxide and water. It

transforms the water into oxygen and the carbon dioxide into glucose.

Given the thermochemical equation for photosynthesis:

6CO2(g) + 6H2O(l)  C6H12O6(s) + 6O2(g) ∆H = 2,803 kJ/mol

1. Find:

a. Calculate the solar energy or the heat required to produce 3,600 g of C6H12O6.

b. Calculate the mass of O2 that is produced in photosynthesis when 32,000 kJ of

solar energy is consumed.

2. Guide Questions:

a. What type of reaction is photosynthesis? Why?

b. What do you call the reversed reaction of photosynthesis? Give its equation.

c. How important is chlorophyll in the process of photosynthesis?

A 10µg/ml solution of drug X gives an absorbance of 0.6 at 270 nm in a tem cell. If the molecular weight of X is 155, calculate the molar absorptivity of X at 270 m.

How would you prepare 2x100 mL of 0.9 M of NaOH solution, starting from 5.01 M stock solution?

How many half-life cycles does it take for a sample of radioactive isotope to reach 12.5% of its original mass?

Uranium-233 undergoes nuclear decay and releases 2 alpha particles, 1 beta particle and 1 gamma particle. Pick the nuclear equation that represents this nuclear reaction.

1) Europium-130 releases 3 alpha particles and 4 beta particles. Write the nuclear equation for this process.

2) How many half-life cycles are required for a sample of radioactive isotope to reach 12.5% of its original mass?

3) Potassium-40 has a half-life of approximately 1.248x109 years. How long does it take for a sample of potassium-40 to decay to 35% of its original mass?

What mass of Potassium has the same number of atoms as 95.7 g of Germanium?

What is the base dissociation constant of hydroxylamine hydrochloride

For the reaction

2NH

3

(g)↽−

−⇀

 3H

2

(g)+N

2

(g)

2⁢NH3⁢(g)⁢↽−−⇀ 3⁢H2⁡(g)+N2⁡(g)

the equilibrium concentrations were found to be [NH

3

]=0.250 M

[NH3]=0.250 M, [H

2

]=0.450 M

[H2]=0.450 M, and [N

2

]=0.800 M

[N2]=0.800 M. What is the equilibrium constant for this reaction?

These are all separate questions. Thank you in advance.

A 500 mL base has a hydroxide concentration of 0.85 mol/L. If this base is diluted to 950 mL, what is the new hydroxide concentration of the diluted base?

In the science storage room, there is a stock solution for an unknown acid. This acid has a hydronium concentration of 0.55 mol/L, and there is 500mL of this acid left. If you dilute this acid to a volume of 1.3L, what is the hydronium concentration of the new acid?

What is the pOH of a solution with 8.5 g of HCl dissolved in 1.00 L of water.

What mass of NaOH is dissolved in 350mL of water if the pOH is 3.82