Inorganic Chemistry Answers

Americium-241 is a radioactive isotope used in household smoke detectors. It decays by alpha decay. Which of the following describes the properties of this radiation? Select all that apply.

1. unlikely to escape the smoke detector
2. made of 4 particles joined together
3. positively charged
4. high energy photons of light

A Mixture Contains 1.5 Liters Oxalic Acid H2C2O4· 2H2O (ρ=1.653 g/mL) and 2-

gallon Water. Determine:

ρ Oxalic acid = 1.653 g/mL

ρ water = 1000 g/L

a) %w/w, %w/v, %v/v of oxalic acid in a solution (6 pts)

b) ppm and ppb of oxalic acid (4 pts)

c) Molarity, Normality, and molality of the solution (10 pts)

36 grams of aspirin is burnt with a flame in presence of excess oxygen until nothing remains. The byproduct gases are collected and it is found that there are 79.2 g of pure CO2 as one of the products. How many carbon atoms are there in each formula unit of Aspirin (MW = 180g)?

Everyone knows that helium makes your voice high pitched, but there is another gas with the opposite effect. It is composed of the elements Sulfur and Fluorine, with the molecular formula SF6. Let’s assume that we perform a reaction in the lab at constant temperature and pressure and that both Sulfur (assume sulfur is monatomic in this state) and Fluorine are in gaseous form. What ratio of elements would give us only product without excess starting material?

Thinking back to our Sulfur Hexafluoride reaction, how big of a vessel would we require to store only the product in liters if we start with 2 moles of Fluorine (with just enough Sulfur to completely convert all Fluorine to the product) at standard temperatures and pressure? Assume that Sulfur Hexafluoride is an ideal gas.

Calculate the freezing point depression and boiling point elevation of a solution

containing 4.27g of Sucrose(C12H22O11) and 50.0g of water. (10 pts)

Kf = 1.86 oC

molal

and Kb=0.512 oC

molal

Throat spray is used in relieving pain and irritation caused by sore throat, sore

mouth, or canker sores. It is composed of a diluted solution of Phenol in water.

The mass percent of the usual throat spray is 1.40% C6H5OH in water. The density

of the Phenol solution and Water are known to be 0.9956 g/ml and 1.00 g/ml

respectively. Calculate the Molarity of the solution. (10 pts)

As part of the analysis of water samples, the hardness of water is commonly

measured and calculated. It is commonly expressed in ppm by mass (parts per

million) of CaCO3. Parts per million is also equivalent to milligrams of CaCO3 per

liter of water. In a sample taken by an environmentalist, he was able to observe

a hardness count of 205 mg CaCO3/L. Given this hardness count of the sample,

what is the molar concentration of Ca2+ ions in the water sample? (5 pts)

A Mixture Contains 1.5 Liters Oxalic Acid H2C2O4· 2H2O (ρ=1.653 g/mL) and 2-

gallon Water. Determine:

ρ Oxalic acid = 1.653 g/mL

ρ water = 1000 g/L

a) %w/w, %w/v, %v/v of oxalic acid in a solution (6 pts)

b) ppm and ppb of oxalic acid (4 pts)

c) Molarity, Normality, and molality of the solution (10 pts)