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Physical Chemistry
Does heptane present a vapor hazard or not? Why?
Physical Chemistry
Complete required calculations and shortly describe how you are going to make showed solutions from already given products?
0.0250L 0.0150mol/L Na2SO4 solution from Na2SO4*10H2O(s)
250g 5% Na2SO4 solution from Na2SO4*10H2O(s)
0.0250L 0.0150mol/L Na2SO4 solution from Na2SO4*10H2O(s)
250g 5% Na2SO4 solution from Na2SO4*10H2O(s)
Physical Chemistry
Prepare 500 ml of 1000ppm stock solution of Fe (Nh4)2 (So4)3.6h2O?
Physical Chemistry
Calculate the wavelength, λ, in meters of a photon capable of exciting an electron in He+ from the ground state to n = 4.
Physical Chemistry
2. The following reaction takes place at high temperatures.
Cr2O3 + 2 Al → 2 Cr + Al2O3
If 42.7 g Cr2O3 and 9.8 g Al are mixed,
a. what is the mass of Al2O3 formed?
b. which between Cr2O3 and Al is the limiting reactant? Excess?
c. how many grams of the excess will be the leftover?
d. if 15.2 grams of Al2O3 were formed, what is the percent yield?
Cr2O3 + 2 Al → 2 Cr + Al2O3
If 42.7 g Cr2O3 and 9.8 g Al are mixed,
a. what is the mass of Al2O3 formed?
b. which between Cr2O3 and Al is the limiting reactant? Excess?
c. how many grams of the excess will be the leftover?
d. if 15.2 grams of Al2O3 were formed, what is the percent yield?
Physical Chemistry
Find the average molecular weight M and specific constant R for air saturated with water vapor at 0oC and 1 atm of total pressure. The vapor pressure of water at 0 degreeC is 6.11mb.
Physical Chemistry
a) Determine the mean molar mass of the atmosphere of Venus, which consists of 95% CO2 and 5% N2 by volume.
b) What is the corresponding gas constant?
c) The mean surface temperature T on Venus is a scorching 740K as compared to only 288K for Earth; the surface pressure is 90 times that on Earth. By what factor is the density of the near-surface Venusian atmosphere greater or less than that of Earth?
Physical Chemistry
Two sealed containers with volumes V1 and V2, respectively, contain dry air at pressures p1 and p2 and room temperature T. The containers are connected by a thin tube (negligible volume) that can be opened with a valve. When the valve is opened, the pressures equalize, and the system re-equilibrates to room temperature. Find an expression for the new pressure.
Physical Chemistry
Show that 1 atm of pressure is equivalent to that exerted by a 760 mm column of mercury at 0 degree C (density is 13.5951 g cm-3) and standard gravity g =9.8 ms-2.
Physical Chemistry
Using the equations of state for the ith gas and the mixture of gases, demonstrate that
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#340153 on Dec 2023
#340153 on Dec 2023