Suppose you have Avogadro\'s number of mini marshmallows and use them to cover the state of Oregon which has a land area of 9.600 × 104 mi2. Each mini marshmallow has a diameter of 0.635 cm and a height of 2.54 cm. Assuming the marshmallows are packed together so there is no space between them, to what height above the surface, in kilometers, will the mini marshmallows extend?

Material Safety Data Sheets or Safety Data Sheets (MSDS/SDS) – The Worker’s Right to Know Law grants employees the right to know the hazards of all chemicals in their work place. These hazards can be found in the MSDS or SDS forms that employers are required to maintain for all hazardous chemicals used at the facility. MSDS and SDS are very similar, but the latter is an updated version designed to increase consistency.

MSDS/SDS: (10pts) (need word file) and post the sources where to find that information

Sources of MSDS/SDS: (1pt)

1, What is the definition of LD₅₀? Identify the source of this definition. (1pt)

2. Assuming that these compounds are similarly toxic to humans, how much of each compound would be required to reach the LD₅₀ for a 150 pound human? Show your calculations. (4pts)

3. Which of the two compounds is more toxic? How can you tell? (2pts)

4. What are the acute effects of exposure for each compound? (1pt)

5. What does the MSDS/SDS recommend be done if each compound is ingested? (1pt)

Rubric:

Sources of documents and definitions cited (URL’s)

Responses in your own words and in complete sentences

Short answer responses supported with evidence, of appropriate length, and grammatically adequate

Organized calculations with units and correct sig figs

Describe an integral in chemical engineering and its application that is important. It should be about Integration by Parts orTrigonometric Integrals and it should then give a full solution. Thank you so much for even taking the time to read this and hopefully someone can help me.

I have this lab for Quantitative Analysis that is worded a little strangely. I was hoping someone could explain what is meant by plotting average measured volume by expected volume delivered. How can one average be plotted against another average?

Prompt: Convert the mass of water to the volume delivered by the pipette. Plot the average measured volume obtained from your replicate measurements delivered versus the expected volume delivered as read on the pipette for the 10 mL pipette. Plot y-value error bars corresponding to the standard deviation obtained from your replicate measurements.  

A heat exchanger is used to transfer heat from a steam stream to a chlorine gas stream. 100 kg of steam at 1 bar and 250°C enters the heat exchanger and leaves the exchanger as saturated steam at 1 bar. Chlorine gas enters the exchanger at 1 bar and 33.0°C and leaves the exchanger at 132.0°C. Assume the heat exchanger is adiabatic.

A)What is the specific enthalpy of the inlet steam stream? (Use liquid water at 0.01°C as a reference state.)

B)What is the specific enthalpy of the outlet steam stream? (Use the same reference state.)

C) What is the specific enthalpy of the inlet chlorine gas stream? (Use chlorine gas at 1 bar and 33.0°C as a reference state.)

D) What is the specific enthalpy of the outlet chlorine gas stream? (Use chlorine gas at 1 bar and 33.0°C as a reference state.)

E)How many moles of chlorine gas enter the heat exchanger?

F)What is the ratio of the volume of inlet steam to the volume of inlet chlorine gas? Use the ideal gas law to calculate the volume of chlorine entering the process.

G)How much heat is transferred from the steam stream per cubic meter of chlorine gas?

Hot water was poured into an empty pop can and allowed to cool in surroundings whose temperature is 20 °C. The initial temperature of the water is 92 °C. After 12½ min the water temperature had dropped by 10 deg C. Assume the rate of change of the water temperature is directly proportional to the difference in the temperature between the water and its surroundings.

a. What is the value of the proportionality constant?

b. What is the temperature of the water after 83 min?

c. When is the rate of change of temperature at its largest?

d. When is the rate of change of temperature at its smallest?

What are the basic characteristics of a metal you need to know while selecting different meal and alloys for medical implant? What is difference between single crystal and polycrystalline metal? Why do you think reducing grain size is one of the strategies to strengthen a metal alloy? (4+2+4)

Using Excel matrix operations to balance the following equation

xC8H16 + yO2 --> zCO2 + tH2O

Question 1 Assuming Raoult's law to be valid for benzene (1)/ ethylbenzene (2), Prepare:

(a) A P-xy diagram (with at least 4 tie lines) for the temperature of 90o C

(b) x-y diagram for the temperature of 90o C

(c) T-xy (with at least 4 tie lines) for the pressure of 90 kPa

(d) x-y diagram for the pressure of 90 kPa

What are the typical major sources of carbon, nitrogen, and phosphorus in industrial fermentations for antibiotics?

For 2N₂O₅(g) = 4NO₂(g) + O₂(g)

1.  Determine, by making the appropriate graphs, whether this decomposition reaction is zero, first, or second order with respect to N2O5

I found by makin the graph in excel that it was a first order reaction

Now here are my questions

2. The stoichiometric coefficient for N205 in the reaction equation is 2. Depending on your answer to Problem 1, explain why the reaction order you obtained in Problem 1 is also 2, or explain why it can be different than 2?

3.Using the "Trendline" feature in the chart and the appropriate integrated rate equation, determine the rate constant for the reaction. (I have no idea how to even begin this in excel or on paper)

4. Sketch a graph showing the relative concentrations of N205, N02, and 02 as a function of time as the reaction proceeds. Your graph should show these concentrations on the same scale, and  should show the final concentrations relative to each other after equilibrium has been reached.  Note that the concentrations can be obtained just by considering the stoichiometry of the reaction. (Im not given the concentration of NO2 and O2)

Consider now a turbine(Q=0) that operates with N2 steam with T1 = 753.15K and P1 = 6 bar and P2 = 1 bar. The efficiency is 80% and the molar flowrate is (note not mass flow rate) is 200 mol/s. The inlet velocity is 30 m/s and the exit velocity is 120 m/s. The inlet is 6 m above the base of the turbine and the exit is 2 m above the base.  

a. Determine the output of the turbine with units.

b. what is the exhaust temperature and quality (if saturated) for 100% efficiency?

Calculate the following:

a. The bubble point temperature of a liquid mixture with a molar composition of 45.0 mol% n-hexane and 55.0 mol% n-heptane at 1.00 atm and the composition (mole fractions) of the vapor in equilibrium with this mixture.

Bubble Point:  _____°C

yHexane:  _____

yHeptane:  _____

b. The dew-point temperature of a gas mixture with a molar composition of 30.0% n-hexane, 35.0% n-heptane, and 35.0% air at 1.00 atm and the composition (mole fractions) of the liquid in equilibrium with this mixture.

Dew Point:  _____°C

xHexane:  _____

xHeptane:  _____

Determine the concentrations of all species in the exhaust from the complete and perfect combustion of an oil with the chemical formula C₁₆H₂₅S_0.1. Assume 51 % excess air (79 mol% N₂, 21 mol% O₂) is the source of oxygen.

A) Calculate the amount of oxygen in moles that must be supplied (includes excess).

B) Calculate the concentration of CO₂ in the exhaust gas in ppm.

C) Calculate the concentration of SO₂ in the exhaust gas in ppm.