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Question: When 1.00 gram of reserpine is dissolved in 25.0 grams of camphor, the freezing point depression is 26.3 degrees C. Calculate the molality of the solution and the molar mass of reserpentine.
A 6 cm string is fastened at both sides is plucked. What is the wavelength of the n = 3 standing wave? How many nodes does it contain.
Suggest a simple chemical test that would distinguish between the following compounds. State what you would see: a) n-pentane and 1-pentene
When ammonia is added to nickel ions in aqueous solution, the water molecules bound to the Ni2+ are replaced by ammonia molecules.
A gas expands and does P-V work on the surroundings equal to 325 J. At the same time, it absorbs 161 J of heat from the surroundings. Calculate the change in energy of the gas.
Chromium metal can be produced from the high temperature reaction of Cr2O3(chromium(III) oxide) with silicon or aluminum by each of the following reactions
A 376 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 630. mmHg. Calculate the moles of Ar present
0.100 moles of benzoic acid and 0.100 moles of sodium benzoate are added to 1.000 liter of water. What is the final pH
Why does surface complex formation with a weak acid lead to a relative maximum in the extent of surface complex formation (adsorption) at a pH which is usually near the value of -log acidity constant of the weak acid (pKHA)
Both of the silicon-chlorine single bonds in are polar. In which direction should the polarity arrows point? away from central Si, towards Si, right or left
Natural gas is a mixture of many substances, primarily CH4,C2H6,C3H8 and C4H10. Assuming that the total pressure of the gases is 1.34 atm and that their mole ratio is 94 : 4.0 : 1.5 : 0.50, calculate the partial pressure (in atmospheres) of each g..
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?
The equilibrium constant Kc for the formation of ammonia: N2(g) + 3H2(g) -> 2NH3(g), is 3.6 x 10^8 at 25 C. What is the concentration of ammonia, when the equilibrium concentrations [N2] = 5.4 x 10^-3 M, and [H2] = 2.1 x 10^-3
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