Solid calcium fluoride (CaF2) reacts with sulfuric acid (H2SO4) to form solid calcium sulfate (Ca... Solid calcium fluoride (CaF2) reacts with sulfuric acid (H2SO4) to form solid calcium sulfate (CaSO4) and gaseous hydrogen fluoride (HF). The HF is then dissolved in water to form hydrofluoric acid. A source of calcium fluoride is fluorite ore containing 96.0 wt% CaF2 and 4.0 wt% SiO2. In a typical hydrofluoric acid manufacturing process, fluorite ore is reacted with 93 wt% aqueous sulfuric acid, supplied 15% in excess of the stoichiometric amount. 95% of the ore dissolves in the acid. The HF(g) exiting the reactor is subsequently dissolved in enough water to produce 60.0 wt% HF (aq). Calculate the product composition from the reactor, and also the amount of water required to generate a 60.0 wt% HF solution.

advantages and disadvantages of a fixed and fluidized bed adsorbent

2.00-mol of a monatomic ideal gas goes from State A to State D via the path A?B?C?D:

Assume that the external pressure is constant during each step and equals the final pressure of the gas for that step.

Calculate q for this process.

Calculate w for this process.

Calculate ?E for this process

Calculate ?H for this process.

Discuss the reasons for introducing nanomaterials to make better sport equipment.
please answer with specific examples at least 2.

Nature always gives the valuable inspiration to improve engineering and science.
List at least 3 examples where we can learn nanoscience and technology.

A gas which obeys the equation of state, PV/RT=1 +BP , where B is a known
temperature-dependent parameter, is fed at a steady rate to an insulated valve where its pressure is reduced from P1 to P2. Given that the upstream temperature of the gas is T1 and that the constant-pressure molar heat capacity of the gas in the ideal gas state is given by Cp* = a + bT, where a and b are known constants, derive an expression for the temperature T2 of the gas downstream from the valve. Express your answer in terms of the parameters given above. Neglect the effect of any kinetic energy change across the valve.

(Chemical engineering)

Explain advantages and disadvantages of nanotechnology and direction of development.

In what ways does establishing a safety and health management system in an organization complement and improve compliance with the OSHA standards? Provide examples in your discussion.

Your response should be at least 200 words in length.

An IV bag is labeled as 0.900% w/w sodium chloride in water solution with a density of 1.025g/mL. What is the concentration of sodium chloride in the solution expressed in molarity, molality, and mole fraction?

Sodium chloride : NaCl, 58.44 g/mol

A bicycle rider is interested in the effects of temperature on air density. A change in temperature will also affect the tire pressure.

a) Write a computer program that calculates air density at atmospheric pressure for temperatures from -10?C to 50?C.

b) Assume that a bicycle tire is inflated to an absolute pressure of 450 kPa at 20?C. Assume also that the volume of the tire does not change with temperature. Write a program to show how the tire pressure changes with the temperature in the same range, -10?C to 50?C.

Prepare a table or graph or both.

5. Boris recently synthesized an explosive compound he named Badenoughium. The molecular formula for Bdenoughium is H5C3N3O9. The balance chemical equation for the ignition of Badenoughium is: 4 H5C3N3O9 (l) ? 12 CO2 (g) + 10 H2O (g) + O2 (g) + 6 N2 (g) a. When Badenoughium is ignited it has a ?H o rxn of - 5678 kJ. i. Determine the ?H o f for the compound Badenoughium. ii. Determine the ?H o rxn for when 1.25 grams of Badnenoughium is ignited. b. Boris ignites 1.25 grams of his compound in a 500.00 mL at a temperature of 100.0 oC. i. Determine the partial pressure for each of the gases produced when 1.25 grams of Badenoughium is ignited. ii. Determine the total pressure in the reaction vessel after 1.25 grams of Badenoughium has been igntited.

the adiabatic flame temperature (theoretical maximum temperature) of black coal in air is over 2000^oC. If the ambient temperature is 20^oC then the theoretical maximum efficiency of a coal fired power station is approximately 87%.

Why then is the efficiency of even the best coal fired power stations less than 50%.

Pollution and climate change are an example of either the Diner's Dilemma or the Tragedy of the Commons. Explain which of the them it is an example of and give reasons for your answer.

Briefly discuss whether fossil-fuel derived energy can ever be environmentally friendly?

a. If a 6 cm diameter cylinder containing 2 g of an ideal gas at 25o C is fitted with a 5 kg piston with a 20 kg weight on the piston, calculate the pressure and volume of the ideal gas if the atmospheric pressure is 1 atm. If the 20 kg weight is removed, provide detailed comments without further calculations on what would happen. You may assume a molecular weight of 28 for the gas.

b. Calculate the energy required to heat a gas from 30o C to 150o C if the gas flow rate and pressure at the heater outlet are 1.5 m3 /min and 125 kPa absolute respectively. Assume the specific enthalpy change is about 4,000 J/mol for the process.