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Elemental sulphur occurs in the solid state as 8-membered rings arranged in rhombohedral crystal structure (S8) which melts at 388 K. It is not apparent however, that sulphur in the gas phase is present as S8 molecules. In an evacuated and closed vessel, S8 was heated until the pressure reached 46.06 Torr at a temperature of 347.0 °C. The density of the gas phase at that point was found to be 0.1528 g L-1. Assuming the gas phase is ideal and composed only of a sulfur species (Sn), calculate a value for n?
What is the heat change in J associated with 37 g of gaseous methanol at 89 oC changing to liquid at -64 oC?
Determine how many moles each of Na+ and Cl- are in 0.700 L of the saline solution (A physiological saline solution contains 167 mEq/L each of Na+ and Cl-.)?
A solution of .162 M NaOH is used to neutralize 25.0 mL of a H2SO4 solution. if 32.8mL of the NaOH solution is required to reach the endpoint, what is the molarity of the H2SO4 solution? H2SO4(aq)+2NaOH(aq)>Na2SO4(aq)+2H2O(l)
An element has three naturally occurring isotopes, calculate the percent abundance and the atomic mass
Metal X was plated from a solution containing cations of X. The passage of 48.25 C deposited 31 mg of X on the cathode. What is the mass of X (in grams) per mole of electrons.
A gas of unknown molar mass was allowed to effuse through a small opening under constant pressure conditions. It required 184 s for 1.00 L of this gas to effuse.
what mass of KNO3 will crystalize out of solution if exactly 9.0x10^2g of its saturated solution at 75c is cooled to 25c
under anaerobic conditions lactic acid builds up due to the following reaction. A) prochiral b) archiral c) chiral d) both archiral and prochiral
At 27.7mL sample CO2(g) was collected over water at 25.0 degrees celsius and 1.00 atm. What is the pressure in torr due to CO2(g)?
A local radio station can be tuned in by dialing your radio to a frequency of 101.5 MHz. Calculate the wavelength. (Hint: MHz means 1 x 106 Hz.)
What relationship exists between H+ ion concentration and OH- ion concentration? What is the OH- concentration in an aqueous solution where the H+
For a given sample of {rm CH_3OH}, the enthalpy change on reaction is 19.0 kJ. How many grams of hydrogen gas are produced?
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