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The freezing points of 0.0935 m ammonium chloride and 0.0378 m ammonium sulfate in water were found to be -0.322 C and 0.173 C. What are the values of the van't Hoff factors for these salts?
What is the percent by mass of NaHCO3 in a solution containing 50 g of NaHCO3 dissolved in 400 mL of H2O?
The active ingredient in some antiperspirants is aluminum chlorohydrate, Al2(OH)5Cl. Analysis of a 2.000-g sample of antiperspirant yields 0.334 g of aluminum. What percent (by mass) of aluminum chlorohydrate is present in the antiperspirant?
a premature infant is born. she weighs less than normal. her mother has been on a near starvation diet for the last month. the infant's blood glucose at birth and 5 hours later is very low. the problem may have been
what is the frequency of the photons emitted by hydrogen atoms when they undergo transistions from n=5 to n=3
What wavelength radiation (nm) must be used to eject electrons from chromium metal with a velocity of 1.50 x 10^6 m/s? The ionization energu of chromium metal is 7.00 x 10^-19 J
The equilibrium constant for this reaction is 1.70 x 10^-3. Suppose that 0.860 mol N2 and 0.580 mol O2 are mixed in a 4.00-L reaction vessel. What will be the concentrations of N2, O2, and NO when equilibrium is established?
Atmospheric pollution is a problem that has recieved much attention. not all pollution, however, is from industrial sources. Volcanic eruptions can be a significant source of air pollution.
ephedrine is used as a bronchodilator and decongestant. phenobarbital is used as an anticonvulsant and sedative. what simple chemical test distinguishes these 2 medicines?
how much energy in kilojoules is required to convert 255 of diethyl ether at its boiling point from liquid to vapor if
A particular first-order reaction has a rate constant of 1.35 × 102 s-1 at 25°C. What is the magnitude of k at 75°C if Ea=85.6 kJ/mol
calculate the mass of sodium nitrate required to produce 7.00 grams of oxygen according to the following reaction: 2NaNO3 = 2NaNO2 + O2
If we assume that the atmosphere of the earth is an ideal gas mixture, then each component is described by a separate barometric equation. This model predicts that the concentrations of heavier molecules, and therefore their partial pressures, dec..
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