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A 28.5 g sample of an unknown metal is heated to 95.0C and then dropped into 58.0 g of water in a coffee-cup calorimeter. The temperature of the water rises from 23.5 C to 27.1C. Calculate the specific heat of iron.
Determine the equilibrium concentrations - what are the new equilibrium concentrations of all species.
While 1.22 g of a white solid, supposed of being pure cocaine, a molecular compound, is dissolved in 15.60 g of C6H6 the freezing point is lowered by 1.32 ¬0C. Compute the molar mass of the solid. Kf value for benzene = 5.12C/m.
A gaseous mixture contains 420.0 Torr of H2(g), 391.3 Torr of N2(g), and 79.5 Torr of Ar(g). Calculate the mole fraction, X, of each of these gases.
Europium crystallizes in a body-centered cubic lattice (the Eu atoms occupy only the lattice points).The density of Eu is 5.26 g/cm3. Calculate the unit cell edge length in pm.
Write a paper on an article and it shows many different compounds and need a better understanding of where each originated and what steps were made in their synthesis.
A power plant burns 10^4 kg hr-1 of coal containing 2.5% sulfur. The effluent is released from a single stack of height 70 m. The plume rise is normally about 30 m.
If the average speed of an oxygen molecule is 4.05multiplied by 104 cm/s at 25°C, what is the average speed of a CO2 molecule at the same temperature?
Using A sample having X amount of oxalic acid. If 0.5187 grams of the sample requires 40.20 mL of 0.1000 M Sodium hydroxide to neutralize the oxalic acid completely.
How many peaks would you expect to find in the NMR spectrum of caffeine? What characteristic absorption bands would you expect to find in the infrared spectrum of caffeine?
What is the molarity (M) of a solution that contains 2.553 grams of NaOH (MM = 40.00 g/mol) in 81.11 mL of solution.
An electron is con?ned to a one-dimensional box of length L. It falls from the second energy level to the ground state, and releases a photon with a wavelength of 322 nm.
A green leaf has surface area 2.20 cm^2. If solar radiation is 1190 W/(m^2) , how many photons strike the leaf every second? Assume three significant figures and an average wavelength of 504 nm for solar radiation.
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