Question

1. Glucose, also known as blood sugar has the formula, C₆H₁₂O₆.

a) Write a balanced equation for the combustion of glucose.

b) If 3.8 kcal is released by combustion of each gram of glucose, how many kilocalories are released by the combustion of 1.50 mol of glucose?

c) What is the minimum amount of energy a plant must absorb to produced 15.0 g of glucose?

2. In the following, does S increase or decrease:

a) A drop of ink spreading out when it is placed in water

b) NaCl_(s)  Na⁺_{(aq) +} Cl^-_(aq)

c) Steam condensing into drops on windows

3. For the reaction C(s, diamond)  C(s, graphite), G = -0.693 kcal/mol at 25^oC.

1. According to this information, do diamonds spontaneously turn into graphite?

2. In light of your answer to part a, why can diamonds be kept unchanged for thousands of years?

4. Fluorine gas reacts with oxygen gas to yield oxygen difluoride gas.

a) Write and balance the reaction:

b) Find the value of K if the following concentrations are found at equilibrium:

Oxygen = 0.200 M

Fluorine = 0.00100 M

Oxygen difluoride = 0.0633 M

5. For reaction in 4 above, explain the effect on the equilibrium of:

a) Increasing pressure by decreasing volume

b) Increasing the concentration of fluorine gas

c) Increasing the concentration of oxygen difluoride gas

d) Adding a catalyst

6. A gas occupies a volume of 538mL at a pressure of 1.02 atm. To what volume (in mL) must the gas be compressed or expanded in order to change the pressure to 704 torr? Assume constant temperature.

7. If 20.0 g of nitrogen gas has a volume of 4.00 L and a pressure of 6.0 atm, what is its temperature in degrees Celcius?

8. A compressed-air tank carried by scuba divers has a volume of 8.00 L and a pressure of 140 atm at 20^oC. What is the volume of air in the tank at STP?

9. Assume that you have 1.75 g of the deadly gas hydrogen cyanide. What is the volume of the gas at STP?

10. The partial pressure of neon in a mixture of two gases is 1.06 atm; the partial pressure of carbon monoxide in that mixture is 3.22 atm. What is the pressure of the mixture?

11. What types of intermolecular forces do each of the following compounds exhibit:

a) C₂H₄ _________________________________________

b) N₂ _________________________________________

c) NH₃ _________________________________________

d) CH₃Cl _________________________________________

12. Name the type of solid:

a) sodium chloride _____________________

b) diamond _____________________

c) glass _____________________

d) copper _____________________

13. How many grams of potassium chloride must be weighed out in order to make 50.0 mL of an 8% (w/v) solution?

14.What is the molarity of 2.00 L of a solution containing 234 grams of glucose, C6H12O6?

15. Calculate the volume of a 0.170 M solution that can be prepared from 50.5 grams of lithium sulfate.

16. Ho much water must you add to 100.0 mL of orange juice concentrate if you want the final juice to be 20.0% of the strength of the original?

Answer 1

Date II Page Balanud en сенсіt (gleuse) Coxygen 6 co (4) + 6H, to carbon I (water) dionich) (b) from I gram of glucose E= 3.8 kcal А том том 1 9 = 5.5 ( 110 м . 1&s SI mo! 5. S6 xo 3 m 2 1.8 kg 1.5 mol - a kea .:*= 3.8x15 1026 kcal. S. SO KIo 3 1 Qom 1 S9 Яам - - Е - 3.8 kcal 15Х3.8 - Sa ko) Клее 4.