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What is the empirical formula for the molecule?
A Molecule has been identified that contains three elements: carbon, hydrogen and oxygen. When the molecule is broken down, the mass percentages are:
C= 40.9%
H= 4.58%
O= 54.5%
The percentage of the x-21 isotope is 87.99% what is the contribution to the weight average from the x-21 isotope which has a mass of 21.00 amu
what mass of iron (ll) chloride is needed to produce 12.6 moles of sodium chloride
The carbinol in citric acid is
The resistance of a conductivity cell filled with an electrolytic solution is observed to be 180 ohm if the resistance of 0.1 M Kcl solution taken in the same cell was found to be 72 ohm calculate the conductivity of the given solution .
Given :the conductivity of 0.1 M Kcl solution =1.291/m
What is wootz steel? How it is produced?
c) One pack of chips weighing 140 g contains 2.5% salt. Decide if Barborka was right that by eating two such packs of chips, the 65-kilogram Samo would exceed the recommended daily dose of salt. (The recommended daily dose is 100 mg per 1 kg body weight)
Potassium iodate is most often used to iodide table salt. The weight fraction of potassium iodate in table salt is 0.006%. 0.59 g of iodine is contained in 1.00 g of potassium iodate.
e) Calculate how much g of salt Samo needs to eat to cover his daily iodine requirement. Assume that Samo does not receive iodine from other sources, only through iodized table salt.
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?
Kp for the decomposition of N2O4 is 0.143 at 25°C. If the initial pressure of N2O4 in a
1.00L flask at
25°C is 0.0500atm, what will be the partial pressures of N2O4 and NO2 and the total
pressure at
equilibrium?
N2O4(g) ⇄ 2NO2(g)
