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A gas of unknown molecular mass was allowed to effuse through a small opening under constant pressure conditions. It required 67 s for 1.0 L of the gas to effuse. Under identical experimental conditions it required 28 s for 1.0 L of O2 gas to effuse. Calculate the molar mass of the unknown gas. (Remember that the faster the rate of effusion, the shorter the time required for effusion of 1.0 L; that is, rate and time are inversely proportional.)
What is the difference between the molecular geometry
When ammonium chloride, NH4Cl, dissolves in water, the temperature of the solution is found to be less than that of the original water sample.
Draw a free energy profile for a reaction S to P that proceeds through a single transition state with Delta G knot equal to +2.8 kcal/mol and delta G double dagger equal to 14 kcal per mole. Label the appropiate difference.
If during the course of the reaction, the vessel is found to contain 9.75mol of C, 15.0mol of H2O, 3.10mol of CO, and 7.80mol of H2, what is the reaction quotient Q?
What are the principal natural sources of hydrogen? What are the principal methods for the commercial preparation of hydrogen?
Calculate the work done in Joules when one mole of an ideal gas, initially at P = 9 atm, T = 298 K is expanded isothermally to P = 1 atm if (a) the expansion proceeds against a onstant external pressure Pext = 1 atm; (b) the external pressure is r..
the volume of a gas is 93 mL when the temperature is 91C. If the temperature is reduced to 5C without changing the pressure, what is the new volume of the gas?
For the reaction 2 HCl + Na2CO3 → 2 NaCl + H2O + CO2 what volume of 0.45 M HCl solution would be needed to produce 2.5 L of CO2 at STP
Gold sells for $1120/oz. One ounce is equal to 28.35g. The molar mass of gold is 196.97g/mol. 1 moldovian franc contains 0.567g of gold. If 1 franc = $1.42, how many atoms of gold are presents in 0.010 moldovian francs?
Dissolving 3g of an impure sample of CaCO3 in HCl produces .656 L of CO2, measured at 293 K and 1.04 atm. What is the percent by mass of the CaCO3 in the sample?
Compute the vapor pressure at 25 °C if it is given that the density of H 2 O=0.9971 g/mL , vapor pressure of H 2 O=23.76 torr, molar mass of sucrose, = 342.3 g/mol,
A student wishes to establish experimentally the number of fungal particles in a fixed volume of air. He uses a liquid medium suitable for the growth of most fungi and exposes the liquid to air in a rectangular container of dimensions 15 cm × 15 c..
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