General Chemistry Answers

How many grams of FeCl₂ will be produced from 7.25 g of HCl in the following reaction?

FeS + 2HCl --> FeCl₂ + H₂S

What is the percent composition of oxygen in lithium oxide

How much substance will be left after 1.5 hours if the half-life is 30 minutes? Assume 100% start amount

Write the net ionic equation for the precipitation reaction that occurs when aqueous solutions of potassium sulfide and aluminum sulfate are combined.

Be sure to specify states such as (aq) or (s). 

what is the percent by mass of barium in barium chloride BaCl2

How many moles of h2so4 are present in 1.63 liters of a 0.954 M solution

A balloon has a volume of 253.2 L at 2.5 atm. The volume of the balloon is decreased to 165.4 L. Determine the new pressure. *

SOLUTION STOICHIOMETRY: Using the given BALANCED EQUATION, and calculate for what is asked in each number. Show complete solutions and write appropriate units for your final answers.

1. How many mL of 0.250 M barium nitrate are required to precipitate as barium sulfate all the sulfate ions from 50 mL of 0.350 M aluminum sulfate?

3 Ba(NO3)2 (aq) + Al2(SO4)3 (aq) --> 3 BaSO4 (s) + 2 Al(NO3)3 (aq

2. 5 mL of nitric acid, HNO3, are required to react with 50 mL of a 1.25 M Barium hydroxide, Ba(OH)2 solution:

2 HNO3 (aq) + Ba(OH)2 (aq) --> 2 H2O (aq) + Ba(NO3)2 (aq)

Determine the concentration (Molarity) of the nitric acid solution (HNO3).

Show your complete solution and write appropriate units for your final answers.

1. An ethanol solution is prepared by dissolving 10 mL of ethanol (C2H5OH) (density: 0.800 g/ml) in a sufficient volume of water to produce 100 mL of solution with a density of 0.982 g/mL. What is the concentration of ethanol in this solution expressed as:

a. Volume percent

b. Mass percent

c. Mass/volume percent

d. Mole fraction of Ethanol

e. Molarity

f. Molality

2. Hydrogen peroxide (H2O2) is a powerful oxidizing agent used in concentrated solution in rocket fuels and in diluted solutions is hair bleach. An Aqueous solution of 30% (m/m) has a density of 1.11 g/ml. Calculate the concentration in terms of:

a. Mole Fraction of H2O2

b. Molarity

The osmotic pressure of 210mL of an aqueous solution containing 0.150g of the enzyme lysozyme is found to be 0.0013atm at 24.850 Calculate the molar mass of lysozyme.