Search & Filtering
Form the covalent bonds between the C and four F atoms tell the bonds they form.
Show by calculation which process produces more energy per gram of material reacting:
Fission of U-235: 92U
235 + 0 n
1 → Zr 40
94 + 58Ce 140 + 6 −1e
0 + 2 0 n
1
Fusion of deuterium:1H
2 + 1H
2 → 1H
3 + 1H
1
Nuclear mass for Ce-140 is 139.8734 and for Zr-94 is 93.8841.
The standard electrode potential for the Fe2+ ↔ Fe3+ + e – half reaction is -0.770 V. a)
Using the Nernst equation [ E = E°− ( 0.059/n) log [Oxid]/[Red]] calculate the voltage of this
half-cell when the [Fe3+] is 1.0 x 10 -3 and [Fe2+] is 1.0 x 10 -1
. b) Calculate the approximate
equilibrium constant (K) for the half reaction.
Titanium is manufactured by heating titanium(iv) chloride with sodium. TiCl4(g) + 4Na(l) ->Ti(s) + 4NaCl(s)
What mass of sodium is required to produce 1 tonne of titanium
As a chemical engineer you need to pump the products without affecting products properties.
Because the flow properties will affect the fluid properties of the products like density and
viscosity. Pumping without destroying product integrity is as important as the heat
exchanger that comes after the pump. The piston pumps can handle very delicate and
viscous food stuffs and can pump up to very high pressure without damaging the food
particles. It can also be applied very successfully in heavy duty applications for industries
other than the food industry.
Answer the following
Pump Can work empty (without product)
1-Requires few spare parts
2- Has no seal in contact with the product
3- Can work at high temperatures (100 °C)
4-Few numbers of valves per volume unit
5-Collect the information from various resources and use the collected data to
formulate&solve the problem.
A furnace is charged with 100kmols of fuel gas,the composition of which is 50% CO,30% H2,5% CH4,5% C2H6 and 10% O2. Dry air is supplied 50% in excess combustion. Assuming complete combustion.
1. Calculate the mass of NaOH required to prepare a one-liter solution with a molarity of 2.80. 2. A quantity of 5.25 grams of NaOH is dissolved in a sufficient amount of water to make exactly a one-liter solution. What is the molarity of this solution? 3. Calculate the molarity of a solution if 80.8 grams of calcium iodide is dissolved in 2250.0ml of water. 4. How many moles of magnesium chloride are present in 60.9ml of a 0.100M magnesium chloride solution? 5. How many grams of KOH are present in 35.0ml of a 5.50M solution?
1. The heat of combustion of 2-propanol at 298.15 K, determined in a bomb calorimeter, is -
33.41 kJ/g. For the complete combustion of one mole of 2-propanol, determine (a) ΔE, and (b)
ΔH.
2. A 1.397 g sample of thymol, C 10 H 14 O (s),is burned in a bomb calorimeter assembly. The temperature increase is 11.23°C, and the heat
capacity of the bomb calorimeter is 4.68 kJ/°C. What is the heat of combustion of thymol,
expressed in kJ/mol C 10 H 14 O?
3. The heat of solution of NaOH is -44.5 kJ/mol NaOH. To what maximum temperature may a sample
of water, originally at 21°C, be raised in the preparation of 500 mL of 7.0 M NaOH? Assume the
solution has a density of 1.08 g/mL and specific heat of 4.00 J/g°C.
4. Brass has a density of 8.40 g/cm 3 and a specific heat of 0.385 J/g°C. A 15.2 cm 3 piece of
brass at an initial temperature of 163°C is dropped into an insulated container with 150.0 g
water initially at 22.4°C. Find the final temperature of the brass-water mixture
Given the following data, calculate the ∆H for the reaction: CaC₂(s) + 2H₂O(l) → Ca(OH)₂(aq) + C₂H₂(g).
Data:
Ca(s) + 2C(graphite) -> CaC2(s) delta H= -62.8 kJ
Ca(s) + 1/2O2(g) -> CaO(s) delta H= -635.5 kJ
CaO(s) +H2O(l) -> Ca(OH)s (aq) delta H= -653.1 kJ
C2H2(g) + 5/2O2(g) -> 2CO2(g) + H2O(l) delta H= -1300. kJ
C(graphite) + O2(g) -> CO2(g) delta H= -393.5 kJ
The Destruction of Jericho The Bible describes the Exodus
as a period of 40 years that began with plagues in Egypt
and ended with the destruction of Jericho. Archeologists
seeking to establish the exact dates of these events have
proposed that the plagues coincided with a huge eruption
of the volcano Thera in the Aegean Sea.
a. Radiocarbon dating suggests that the eruption occurred
around 1360 bce, though other records place the
eruption of Thera in the year 1628 bce. What is the
percent difference in the 14C decay rate in biological
samples from these two dates?
