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MnO2+4HCl=MnCl2+Cl2+2H2O
A binary mixture of methanol-water containing 60 mole % methanol is charged to a batch still with two equilibrium stages operating at a pressure of 1 bar. The distillation is carried out until 60 % of the charge (on molar basis) has been taken as distillate product. A total condenser is used and the reflux is at boiling point. The still operates at a constant reflux ratio of 1.0. Stating clearly any assumption made, determine the mean composition of the overhead product.
Which bond is most polar?
(1) H-H (2) H-C (3) H-N (4) H-F (5) H-Cl
Calculate the concentration of naOH solution in g/dm3
(H=1, C=12, O=16, Na= 23)
At constant temperature, a sample of helium gas expands from 922 mL to 1.14 L against a pressure of 2.33 atm. Find w (in J) done by the gas (1J = 9.87310 expoent -3 atm L).
N2(g)+3H2(g) --->2NH3(g)
If ΔH = -92.2kJ and ΔS= -0.1987kJ/K, what is ΔG for the reaction at 475°C and at 5°C? Provide the answer in kJ. In each case, is the reaction spontaneous?
An ideal gas undergoes a mechanically reversible process (constant pressure, constant temperature and adiabatic process. The gas entering a T1=650K and P1=10bar decreases its temperature at constant pressure where V2=2.91x10-³m³
Then, it went to isothermal process to decrease its pressure. Finally, the gas returns to its initial state. Take Cp=7/2 and Cv==5/2 R.
Calculate the following:
a. T2,P3, V1 and V3
b. Q, W,ΔU and ΔH
What is the molar concentration of active disinfectant if she dissolve 5 tablespoon of nacl for the sodium hypochlorite in 3.8 m of water
What is the density of the water when:
a. The weight of an empty graduated cylinder was 50 g.
b. 20 mL of water was placed in the graduated cylinder.
c. The weight of the graduated cylinder and water was 70 g.
A newly discovered pollutant is fossil fuels was characterized to determine its composition. Elemental analysis shows the presence of carbon,hydrogen and sulfur elements in the compound. When burned with excess oxygen 0.397 g carbon dioxide 0.190g water and 0.193 g sulfur dioxide were found as products. What is the mass percent of the pollutant in fuel??
