Question #7 On a journey deep into the Klingon empire, the Starship Enterprise runs out of dilithium crystals, and is forced to use hydrazine, N2H4, as a backup fuel. Passing N2H4 over a catalyst causes it to decompose according to: 3N2H4(l)→catalyst4NH3(g)+N2(g) What total volume of gases at 841 °C and 30.1 atm are produced by the reaction of 2.1×106 g N2H4? L Question #8 The molecular-level representation of a mixture of gases A, B and C is shown to the below. The partial pressure of gas C is 39.7 kPa. What is the mole fraction of gas C? What is the total pressure in kPa? kPa What is the partial pressure of gas A in kPa? kPa Question #9 Intraocular gases are dense, unreactive gases that are used for some vitreoretinal surgeries, such as repairing detached retinas. A particular intraocular gas consists of 21.95% S and 78.05% F by mass. The density of this intraocular gas is 5.68 g/L when the temperature is 24.7°C and its pressure is 0.951 atm. What is the molecular formula for this intraocular gas? When entering the formula place the elements in the following order: S,F. For subscripts, write the number after the element it corresponds to. For example, H2O should be written as H2O. Question #10 The four most common gases in the atmosphere are N2, O2, Ar, and CO2. The gas with the highest average molecular speed at 25oC is The gas with the lowest rate of effusion at 25oC is . The gas with the highest average kinetic energy at 25oC is Question #11 A 5.00 L flask containing Ne at 25oC and 4.00 atm is joined by a valve to a 2.50 L flask containing He at 25oC and 6.00 atm. The valve is opened and the gases mix. If the temperature is constant, what is the (total) pressure in the connected flasks after mixing? atm Question #12 Naturally occurring uranium contains about 0.7% of the fissionable isotope 235U, with almost all the rest 238U. Since gaseous 235UF6 diffuses about 0.4% faster than 238UF6 , diffusion produces a mixture that is slightly enriched in 235UF6 . Multiple diffusion steps – hundreds are needed – can then produce the necessary 235U concentration for use in reactors or bombs. A sample of 235UF6 gas in a 15,000 L cylinder exerts a pressure of 167 kPa. The root-mean-square speed of the 235UF6 molecules is 159 m/s. What is the temperature of the sample of 235UF6 gas? K
On a journey deep into the Klingon empire, the Starship Enterprise runs out of dilithium crystals, and is forced to use hydrazine, N2H4, as a backup fuel. Passing N2H4 over a catalyst causes it to decompose according to:
3N2H4(l)→catalyst4NH3(g)+N2(g)
What total volume of gases at 841 °C and 30.1 atm are produced by the reaction of 2.1×106 g N2H4?
L
The molecular-level representation of a mixture of gases A, B and C is shown to the below. The partial pressure of gas C is 39.7 kPa.
What is the mole fraction of gas C?
What is the total pressure in kPa? kPa
What is the partial pressure of gas A in kPa? kPa
Intraocular gases are dense, unreactive gases that are used for some vitreoretinal surgeries, such as repairing detached retinas. A particular intraocular gas consists of 21.95% S and 78.05% F by mass. The density of this intraocular gas is 5.68 g/L when the temperature is 24.7°C and its pressure is 0.951 atm. What is the molecular formula for this intraocular gas?
When entering the formula place the elements in the following order: S,F. For subscripts, write the number after the element it corresponds to. For example, H2O should be written as H2O.
The four most common gases in the atmosphere are N2, O2, Ar, and CO2.
The gas with the highest average molecular speed at 25oC is
The gas with the lowest rate of effusion at 25oC is
.
The gas with the highest average kinetic energy at 25oC is
A 5.00 L flask containing Ne at 25oC and 4.00 atm is joined by a valve to a 2.50 L flask containing He at 25oC and 6.00 atm.
The valve is opened and the gases mix. If the temperature is constant, what is the (total) pressure in the connected flasks after mixing?
atm
Naturally occurring uranium contains about 0.7% of the fissionable isotope 235U, with almost all the rest 238U. Since gaseous 235UF6 diffuses about 0.4% faster than 238UF6 , diffusion produces a mixture that is slightly enriched in 235UF6 . Multiple diffusion steps – hundreds are needed – can then produce the necessary 235U concentration for use in reactors or bombs.
A sample of 235UF6 gas in a 15,000 L cylinder exerts a pressure of 167 kPa. The root-mean-square speed of the 235UF6 molecules is 159 m/s. What is the temperature of the sample of 235UF6 gas?
K
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