General Chemistry Answers

A balloon is partially inflated with 6.56 liters of helium gas at sea level, where the atmospheric pressure is 1.00 atm. The balloon ascends to an altitude of 1600 meters, where the pressure is 0.59 atm. What is the volume of the helium balloon at the higher altitude

How many atoms of hydrogen are there in 0.20 mol of procaine, C₁₃H₂₀N₂O₂

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 K-1.86 °C/m

When transferring the dissolved solute into the volumetric flask, you should rinse the beaker with solvent to ensure that all the solution is transferred.

True or False

When making up a solution of known concentration, you should first dissolve the solute in a minimum volume of solvent.

True or False

Which of the following statements is correct regarding the use of a funnel in the top of a volumetric flask?

1. Use as large a funnel as possible to prevent splashing some of the contents.
2. Use a funnel of a size that will not cause the flask to become top-heavy and unstable.
3. Use a stemless funnel.

When transferring the dissolved solute into the volumetric flask, you should rinse the beaker with solvent to ensure that all the solution is transferred.

True or False

A buffer solution is prepared via adding solution A (Sodium

dihydrogen phosphate 27.6 gm up to 1000mL distilled water) and

solution B (Disodium hydrogen phosphate 5.362gm up to 100mL

distilled water). During preparation, 1000 mL buffer is prepared

via adding 80mL of solution B to 920mL of solution A. Show a

theoretical approach to calculate the pH of the buffer solution.

Bond energy is the amount of energy, in kJ, which must be supplied to break one mole of the bond. Use the data in the table to show that the following reaction is exothermic. 

give the molar concentration (M) for each of the solutions indicated.

23.1 grams of NaOH are dissolved in enough water to make 1,000.0 mL of solution.

A. 0.577 L

B. 0.577 M

C. 5.77 L

D. 5.77 M

E. Atoms can simply join together only in simple, whole-number ratios.