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Suppose that the microwave radiation has a wavelength of 12.4 . How many photons are required to heat 215 of coffee from 25.0 to 62.0 ? Assume that the coffee has the same density, 0.997 , and specific heat capacity, 4.184 , as water over this temperature range.
Given the average bond enthalpies listed below, calculate the delta H for the reaction: N2 + 3H2 --> 2NH3
Container A (with porous walls) is filled with air at STP. It is then inserted into a large enclosed container (B) which is then flushed with H2(g). What will happen to the pressure inside container A?
34.62 mL sample of .1510 molar NaOH was needed to completely neutralize 50 mL of an H2SO4 solution. what is the concentration of the origional sulfuric acid solution?
How many moles of NaOH will need to be added to 100.0 mL of 0.100 M acetic acid to make a buffer with a pH of 5.00?
You have prepared a saturated solution of at 20 degree celcius using 31.0 of water. How much more solute can be dissolved if the temperature is increased to 30 degree celcius.
Determine the partial pressure and total pressure of the gases and Find the partial pressure of carbon dioxide in a gas mixture
if 135 g of steam at 100 degrees C and 475 g of ice at 0 degrees C are combined, what is the temperature of the resultant water, assuming that no heat is lost?
The mass spectrum of an organic compound shows the relative abundances of M to be 85.12% and M+1 to be 0.9206%. Assuming the peaks are caused by C-12 and C-13 isotopes
The products of our reaction (1- and 2-heptene) can form peroxides upon standing in air for a prolonged period of time
Methyl red (Ka = 7.9 x 10^-6 is added to a buffered solution of unknown pH. Spectrophotometric measurements show the ratio of the basic to the acidic form of the indicator to be 2.57 to 1.000. Calculate the pH of the buffer solution.
An evacuated (empty) 276 mL glass bulb weighs 129.6375 g. Filled with an unknown gas, the bulb weighs 130.0318 g. Calculate the gas density in g/L.
a solution of ammonia and water contains 4.00×1025 water molecules and 8.20×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
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