General Chemistry Answers

[CH₃NH₂ + H₂O ⇌ CH₃NH⁻+ H₃O⁺] Determine the dissociation constant for the following reaction if the equilibrium of the reactants and products are: 2M, 2.3M, and 1.6M for the CH₃NH₂, CH₃NH⁻, and H₃O⁺, respectively. Is it a strong acid, a weak acid, a strong base, or a weak base?

A sample of argon gas occupies a volume of 8.89 L at 49.0°C and 0.600 atm.

If it is desired to decrease the volume of the gas sample to 5.95 L, while increasing its pressure to 0.763 atm, the temperature of the gas sample at the new volume and pressure must be what in degrees celsius?

A mixture of krypton and xenon gases at a total pressure of 874 mm Hg contains krypton at a partial pressure of 508 mm Hg. If the gas mixture contains 14.6 grams of krypton, how many grams of xenon are present?

A 473mL solution of calcium hydroxide has a pOH of 1.025. Calculate the mass of calcium hydroxide required to prepare this solution

A sample of gas has an initial pressure of 1.5 atm, an initial volume of 3.0 L, and an initial temperature of 293K. If the final pressure is 2.5 atm and the final temperature is 303K, what will the final volume be?

Camphor (C10H16O2) freezes at 175 °C, and it has a particularly large freezingpoint-depression constant, Kf = 40.0 °C/m. When 0.086 g of an organic substance of unknown molar mass is dissolved in 22.01 g of liquid camphor, the freezing point of the mixture is found to be 1.7 °C below of pure camphor. What is the molar mass of the solute?

You add 0.25 g of an unknown solute to 11.1 g of benzene. The boiling point of the benzene rises from 80.10 °C to 80.46 °C. What is the molar mass of the compound? Kb=2.53 °C /m 

A solution of an unknown non-dissociating solute was prepared by dissolving 0.300 g of the substance in 40.0 g of CCl4. The boiling point of the solution was 0.357 °C higher than that of the pure solvent. Calculate the molar mass of the solute. Kb=5.02 °C/m

A solution of 100.8 g of a non- dissociating solute in 135.0 g of water has a freezing point of -5.16 °C. What is the molar mass of the solute? Freezing point of water= 0 °C Kf=1.86 °C/m

A solution of 1.51 g of a non-dissociating solute in 250.0 g of water is observed to boil at 124.3 °C. Calculate the molar mass of the solute? Boiling point of water=100 °C Kb=0.51 °C/m

Determine the molar mass of a non- dissociating if 20.0 g dissolved in 100.0 mL of solution to give a resulting osmotic pressure of 6.48 atm at 25 °C

Does the mitochondrial matrix ever run out of protons for pumping in oxidative phosphorylation?

a.      Assuming that the acid is a strong monoprotic acid, what is the molarity of the acid?         

b.     Assuming that the molarity of the acid is the same as the hydronium ion [H₃O⁺] concentration, what is the pH of the acid?                                                                                                                

Differentiate between saturated and unsaturated fatty acids