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Problem- Suppose that the microwave radiation has a wavelength of 12cmcm . How many photons are required to heat 305mL of coffee from 25.0C to 62.0 C? Assume that the coffee has the same density, 0.997g/mL , and specific heat capacity, 4.184 J/(g*K) , as water over this temperature range.
Express the number of photons numerically.
Use the following data to plot the inflection points for the heating curve of 1 mole of solid octane at its melting point, -56.8 degrees C. The first point should be at -56.8 and the last point should be at 150 degrees celcius.
From the mean bond enthalpy data given below, estimate the enthalpy change for the complete combustion of one mole of butene at 298 K. (The molar enthalpy of vaporization of water is 45.0 kJ mol-1 at 298K)
Compound A is reacted by CrO3 in H2SO4 to give compound B. Compound B gives a molecular ion peak of 134 on low resolution mass spec as well as has a DU=5. Explain what is the molecular formula
A 2.29 g sample of ascorbic acid is titrated with a 0.64 M red dye. What volume of red dye is required to reach the endpoint?
a sample has a mass of m1g that contains 2 radioactive elements 20 of element one and 80 of element 2 with molar masses
What is the pH at the equivalence point. f) What indicator would be most suitable for this titration. g) What is the pH when 105% of the required base has been added
Antimony is alloyed with lead to enlarge the rigidity of components utilize in the construction of lead storage batteries. 2.048 g of a particular metallic alloy, compounded of only Pb and Sb, can be quantitatively converted into a 2.383-g mixture ..
Calculate brightness of a wavelength undergoing Rayleigh scattering.
Question- You are creating a buffer using a 0.150 M formic acid (HCOOH) and a 0.120 M sodium formate (HCOONa). Part 1) Write the equation for the reaction
Suppose 1500 J of heat energy are put into a sample of liquid water at 25 degrees celsius, and the final temperature of the water is 75 degrees celsius. How many grams of water are present?
One is a metalloid; the other is a metal. Both form oxides of the formula RO2. the first is acidic; the next is amphoteric. Identify the two elements and explain your reasoning.
Calculate the equilibrium constant for the chemical system described by the following chemical equation: 4 Al (s) + 6 Ni2+ (aq) 4 Al3+(aq) + 6 Ni(s) The 2+ and 3+ indicate charge. How do you calculate the Keq
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