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light of wavelength 221nm striking a sample of tungsten causes electrons to be ejected with a speed of 6.04x10^5 m/s. calculate the work function of tungsten. (E= work + 1/2mv^2, m = mass of electron = 9.10939x10^-31 kg, v= speed of electron)
A piston has an external pressure of 5.00 atm. How much work has been done if the cylinder goes from a volume of 0.130 liters to 0.540 liters.
A sample of lead releases 221 kJ of heat when freezing. What is the mass of the sample? DHfus = 23 J/g
When heated, ammonium carbonate decomposes as follows. NH4CO2NH2(s) -> 2NH3(g)+CO2(g) At a certain temp, the equilibrium pressure of the system is 0.318 atm. Calculate Kp for the reaction.
The rate of bacterial hydrolysis of fish muscle is twice as great at 2.2 degrees C as at -1.1 degrees C. Determine the activation energy for this reaction.
When a 0.369 g sample was studied by combustion analysis, 0.662 g of CO2 and 0.0897 g of H2O formed. How many moles of each of the following were in the original sample? C: ? H: ? Cl: ? What is the molecular formula?
How many types of nonequivalent protons does the following compound contain
A buffer solution is prepared by adding 32.8 grams of sodium acetate, NaC2H3O2 to 1.00 L of 0.500 M acetic acid, CH3CO2H. Ka = 1.8 x 10-5 for acetic acid.
Empirical and Molecular Formulae, The analysis of an organic compound produces the following elemental analysis: % C is 59.999% and % H is 4.476%.
What is the magnitude of the electric field amplitude associated with the beam and the corresponding photon density per cm3?
Nitrogen reacts with a metal to form a compound in which there are three atoms of the metal for each atom of nitrogen. If 1.486 g of the metal reacts with 1.000 g of nitrogen
Which of the following bond moments would cancel the lone pair moment? S=O S-F N-H another lone pair Consider the molecules F2, OF2, PF3, CF4, and BF3. Which molecules have a dipole moment?
f the water if brought to the vapour state at 204C and 710 KPa, where its enthalpy is 2649.4 KJ/Kg and its specific volume is 291.8 cm^3/g, what is the internal energy (U) at these conditions in KJ/Kg? c) Calculate the change in internal energy (d..
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