Chemistry Answers

35 grams of ethanol is dissolved in 115 grams of water.  What is the concentration of ethanol in parts per billion (ppb)

Draw the chemical structure for the 5-isopropyl-2-sec-butyl-cyclonon-1-ene. 

A 4.00 L rigid vessel (see figure below) holds 2.00 L of pure water. The remaining volume holds N2 at 45.0°C. At this stage the pressure gauge on the vessel reads 85.0 kPa. You then load 13.2 g of Be(NO3)2(s) and 15.4 g of N2H5Cl(s) to the container. The salts dissociate completely and a reaction occurs producing both NO(g) and more N2(g). After the reaction has completed, the temperature increased by 5.00°C, with no change in the liquid volume.

Assume that:

o No gas escaped or entered the vessel during the loading of the reagents.

o The liquid phase is free of any gaseous species.

o The ideal gas law applies.

o The reaction is irreversible with a yield of 88.0%.

i. Show that the balanced reaction in alkaline (basic) medium is given by:

4𝑁𝑂3 − (𝑎q) + 3𝑁2𝐻5 + (𝑎q) → 4𝑁𝑂(𝑔) + 3𝑁2(𝑔) + 7𝐻2𝑂(l) + 𝑂𝐻(𝑎q) −

(Show all balancing steps clearly)

ii. Calculate the number of moles of N2(g) and NO(g) after the reaction.

iii. Calculate the partial pressure of N2(g) and NO(g) in kPa after the reaction

What was the effect of the addition of FeCl3 to the sample solution in the dichromate titration? Explain

A solution made by dissolving 9.81 g of a nonvolatile nonelectrolyte in 90.0 g of water

boiled at 100.37

oC at 760 mm Hg. What is the approximate molecular weight of the

substance?

Answer the following questions IN YOUR OWN WORDS please dont copy paste

1. Vitamin D, a fat-soluble vitamin, is an important agent in maintaining our bones healthy. Because of its purpose, Vitamin D supplements are taken by people in considerable amounts. Explain why people should only take Vitamin D supplements in regulated amounts and not in large quantities.

2. Patrick boils a 7-Up beverage. What will happen to it? Explain in terms of temperature as a factor affecting the solubility of gases in liquids.

3. Bien bought a bottle of Mountain Dew. He has an upcoming exam and unintentionally shakes the bottle out of nervousness. What will happen when he opens the bottle? Explain why that will happen in terms of Henry's Law.

The vapor pressures of pure toluene and pure benzene at 25°C are 13.5 and 95.2 mmHg, respectively. A solution is prepared in which the mole fractions of toluene and benzene are 0.4 and 0.6, respectively. What are the partial pressures of the benzene and toluene above this solution? What is the total pressure of the solution?

An LPG tank contains 11.0 kg of butane gas, (C4H10), in a 25.0 L gas tank. What must be the pressure of the gas inside the tank when the temperature is 25 DEGREES CELCIUS?

What would be the pressure of 1.5 moles of Oxygen gas in a vessel with a volume of 5.0 L and temperature of 24 DEGREES CELCIUS?

 The fermentation of glucose produces ethanol and carbon dioxide as follows: C6H12O6 --> 2C2H5OH + 2 CO2. How many grams of ethanol will be produced when 4 grams of glucose reacts in this fashion? (The molar mass of glucose is 180 g/mol while ethanol is 46 g/mol).