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A 454 g block of lead is at an initial temperature of 22.5 degrees Celsius. Define what will be the temperature of the lead after it absorbs 422 kJ of heat from its surroundings?
In the hydrogen atom, for which transition is the emission line observed at shorter wavelength, n=4 to n=2 or n=5 to n=1? Show the equation needed to figure this out. Consider the relative size of delta E to determine the relative wavelength.
reaction vessel initially contains 153 torr of water at 700.0 {\rm K} in contact with excess solid carbon, find the percent by mass of hydrogen gas of the gaseous reaction mixture at equilibrium.
What is the mass of NH3 in a 80.0 cm^3 sample that has a density of 0.92g/cm^3 and consists of 20%(by mass) of NH3
if 0.00484 mol N2O effuses through an orifice in a certain period of time, how much NO2 would effuse in the same time under the same conditions ?
Balance the following redox reaction if it occurs in an acidic solution. What are the coefficients in front of H2C204 and H2O in the balanced reaction. MnO4^-(aq)+H2C2O4(aq)--> Mn^2+(aq)+CO2(g)
For 1 mol of an ideal gas, pext = p = 101 kPa (pressure remains constant). The temperature is changed from 100 degrees C to 25.0 degrees C. Calculate q, w, ΔU and ΔH. Assume CV,m = 3/2 R.
When solutions of silver nitrate and calcium chloride are mixed, silver chloride precipitates out of solution according to the equation
What is the enthalpy change (in kJ) for burning 73.0 g of methyl alcohol? 2)A reaction that is used to propel rockets is N2O4(l) + 2N2H4(l) --> 3N2(g) + 4H2O(g)
what is the standard-state heat of reaction for the dissociation of dinitrogen tetroxide b.) determine the equilibrium composition of this mixture of 50C and 0.1, 1, and 10 bar. c.) repeat the calculation at 200C
What is the concentration of Cu2+ in the following cell at 25 degrees C if the cell voltage is 0.955V?
If 9.0 g of Al metal react with excess HCL according to the balanced equation (2Al(s) + 6HCL(aq)----> 2AlCl3(aq) + 3H2(g)), what volume of hydrogen gas at STP will be produced
What is the final concentration of a solution made from 7.1 mL of 0.8 M CuSO4 and 14.3 mL of water?
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