General Chemistry Answers

Preparing a 10% w/v NaCl solution

Determine the amount in grams of NaCl needed to prepare 10% w/v NaCl

solution. Weigh this amount of sodium chloride in a 50 mL beaker. Add about 30

mL distilled water and stir. Once the sodium chloride has dissolved completely, pour

it into a 100 mL volumetric flask. Add distilled water up to the mark to bring the

volume to 100 ml. Mix thoroughly. Caution: Do not simply measure 100ml of water

and add 10g of sodium chloride. This will introduce error because adding the solid

will change the final volume of the solution and throw off the final percentage

Preparing a 10% w/v NaCl solution

Grams of NaCl = _______________

Calculation:

A solution has a volume of 375mL and contains 42.5g of NaCl. What is its molarity?

The pH of a 0.0040 M solution of HNO₃ is

Use the molar volume of a gas at STP to calculate the density (in g/L) of oxygen gas at STP.

Identify the 4 quantum numbers from the given electronic configurations

a. 3p³

b. 5p⁵

c. 4s²

d. 3p¹

Aqueous hydrochloric acid HCl will react with solid sodium hydroxide NaOH

 to produce aqueous sodium chloride NaCl and liquid water H2O. Suppose 8.0 g of hydrochloric acid is mixed with 17.1 g of sodium hydroxide. Calculate the minimum mass of hydrochloric acid that could be left over by the chemical reaction. Round your answer to 2 significant digits. 

If gas C effuses twice as fast as SO2, what is the molecular weight of gas C?

which compounds exhibit hydrogen bonding forces?

Write a net ionic equation for the reaction that occurs when potassium sulfite(aq) and hydroiodic acid are combined

SiO2 + 4HF —> SiF4 + 2H2O

2.50g of H2O 12.2g of SiO2

what is the mass of SiF4?

what is the percentage yield of SiF4?