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At s.t.p,a mass of gas occupies a volume of of 802cm³.find the pressure at which the gas occupies 950cm³at 320k
Normally, when you think of a metal in water, you imagine it sinking. Surprisingly, the first three alkali metals all float because they are less dense than water. They also move around the surface as bubbles of gas are produced. What is the gas?
As we move down the alkali metals group, from lithium to sodium to potassium, the elements become progressively:
Cd (s) + 2H + (aq) Cd 2+ (aq) + H 2 (g)
State the effect on the E cell when the following changes are made.
a) The pressure of gas increased in the cathode compartment.
b) Sodium hydroxide is added at cathode compartment.
c) Decreasing the concentration of Cd 2+ .
d) Increasing the diameter of electrodes.
Find the free energy change at 25 oC for the cell reaction for the following electrochemical cell where Eocell = + 0.281 volts :
Cu | Cu+(1 M) || Ag+(1 M) | Ag
A balloon contains 7.5 L of helium gas at 25°C under atmosphere pressure. If the balloon is placed in a freezer that has temperature of -4.6°C inside, to what volume will the balloon shrinks
You have a string like a wire that consumes in precisely one moment. The wire is inhomogeneous and it might consume gradually from the start, then, at that point, rapidly, gradually, etc. you need to coordinate and not watch. How would you gauge precisely 30 seconds?
a solid 6.45 - cm square cube is made with a material that has a density of 1.13 g•cm^-3 . Calculate the centigram mass of this cube. Recall that the volume of a cubic shape is defined as the product of length x width x height
what mass of iron (ll) chloride is needed to produce 12.6 moles of sodium chloride
19. The equilibrium constant, Kc, for the dissociation of PCl5(g) is 4.2x10-2 at 250°C. How
many moles and grams of PCl5(g) must be added to a 3.0L flask to obtain a Cl2(g)
concentration of 0.15M?
PCl5(g) + Δ ⇄ PCl3(g) + Cl2(g) ΔH° = 92.5kJ
20. What is the Kp for the reaction in problem #19? What is the equilibrium partial
pressures of each of
the species in problem #19? What is the total pressure of the system in problem #19 at
equilibrium? What is the partial pressure of PCl5(g) before any of it decomposed?
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