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A sample of a bright blue mineral was weighed in air, then weighed again while suspended in water. An object is buoyed up by the mass of the fluid displaced by the object. In air, the mineral weighe
A certain reaction has the following general form.Determine the value of the rate constant for this reaction. Calculate the half-life for this reaction.
For the reaction Ag2S(s) > 2Ag+ (aq) + S2- (aq) what happens to the equilibrium position if ammonium sulfide is doubled ?
3 Zn(s) + 2 Bi3+(aq) → 3 Zn2+(aq) + 2 Bi(s) What is the standard reaction free energy? Faraday's constant is 96485 C/mol. Answer in units of kJ/mol
A gas expands and does P-V work on the surroundings equal to 3.2x10^2 J. At the same time, it absorbs 111 J of heat from the surroundings. Calculate the change in energy of the gas.
During backwashing process of a softener tank, resin in the tank is regenerated using brine solution. The Reynolds's number in the tank is needed to be maintained in a range of 4500 to 5500 for effe
when 0.60 mol of gas x and 0.40 mol of gas y react in a 2.0 l container tp produce z, an equilibrium is reached in which (z) is found to 0.80 mol/l. The reaction is x(g) + 2y(g)=2z(g). Calculate the
He was surprised that most of the white solid melted sharply between 121 and 122oC but that a small amount remained unmelted even at temperatures above 200oC. Explain this behavior.
Write the equation for the overall reaction to be performed in the phase transfer catalysis experiment and label the nucleophilic and electrophile.
A piston has an external pressure of 5.00 atm rm atm. How much work has been done in joules if the cylinder goes from a volume of 0.160 liters to 0.570 liters.
A strip of aluminium of mass 23.8 g is dropped into a beaker of dilute hydrochloric acid. Calculate the work done (in J) on the surrounding atmosphere (1atm pressure, 19.9 oC) by the evolution of hy
It takes 480. J of energy to raise the temperature of 103.1 g mercury from 20.0°C to 53.5°C. Calculate the specific heat capacity and the molar heat capacity of mercury.
a sample of of myoglobin with mass 1.00g is dissolvd in 100ml of aqeous solution. Theosmotic pressure of the solution is 11.0 torr at 25.00degree celcius . find the molar mass of myoglobin ?
If the river velocity is 40 cm/sec and the longitudinal dispersion coefficient is0.1 m2/ sec, what is the maximum concentration expected at the plant.
The half life for the first order decomposition if this compound is 20500 s. how long will it take for a sample of N2O5 to decay to 60% of its initial value?
You are designing a drier that must evaporate 200 lb/h of H2O from sludge by using air. Air at 70°F and 50% relative humidity is drawn into the drier and it leaves at 140F and 70% relative humid
If the sample had not been filtered, how much of this chemical would have been measured? Express in terms of measured concentration C (mg/litre) of the filtered sample?
The second-order diffraction (n = 2) for a gold crystal is at an angle of 22.20° for X rays of 154 pm. What is the spacing between these crystal planes?
A sealed syringe contains 5cc of oxygen gas under 14.7psi of pressure. If the pressure on the syringe is increased to 36.8psi, but the temperature remains constant, what is the volume of the oxygen
What is the new temp. in degrees celsius, when the volume of the sample is charged at constant pressure and volume of 6.00L
Calculate the value (calories) for the heat of solution of 4.00 g of NaOH. Calculate the number of calories that would be produced if one mole of sodium hydroxide was dissolved.
A solution of 350mg of optically active 2-butanol in 10 mL of water, placed in a 20 cm cell shows an optical rotation of +6 .24o. What is the specific rotation of this compound?
What mass of water (in grams)is contained in 2.8L of the vapor above this solution at 55 celcius? the vapor pressure of pure water at 55 celcius is 118 torr.
How many elastic scatters, on the average, are required to slow a 1-MeV neutron to below 1 eV in (a) 16O and in (b) 56Fe?
Only 1.40 mg of pure penicillin having an activity of 280 cpm was recovered. What was the penicillin content of the original 5.00 kg of crude penicillin?