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(a) Calculate the energy of a photon of electromagnetic radiation whose frequency is 6.75 X 1012s-1.
(b) Calculate the energy of a photon of radiation whose wavelength is 322 nm.
(c) What wavelength of radiation has photons of energy 2.87 X 10-18J?
331 mg of an unknown acid was titrated with 0.110 m sodium hydroxide. the equivalence point is at 25.00 ml. what is
The temp rises to 17.9 degrees celsius. Neglecting heat capacity of container, what is the specific heat of the metal? The specific heat of H2O(l) is 4.18 J/(g*degree Celsius)
How many moles of HF (Ka = 6.8 10-4) must be present in 0.165 L to form a solution with a pH of 2.25?
She pours a 50.0mL sample of water at 345K into the calorimeter containing a 50.0mL sample of water at 298K. She carefully records the final temperature as 317K. Explain what is the value of Ccal for the calorimeter
1. Use average bond energies to calculate ΔHr for the combustion of ethanol. CH3CH2OH(g)+3O2(g)→2CO2(g)+3H2O(g) Express your answer using four significant figures.
Consider the following mechanism for the oxidation of bromide ions by hydrogen peroxide in aqueous acid solution
a sample of iron absorbs 67.5 j of heat upon which the temperature increases from 21.5 c to 28.5 c. if the specific
the recommended adult dose of elixophyllin a drug used to treat asthma is 6 of body mass. calculate the dose in
Problem- Determine the element of lowest atomic number that contains a complete d subshell in the ground state.
Consider all possible reactions except reactions of conjugate bases of strong acids with water and complex ion formation for which equilibrium constants are less than 10. You can ignore the effects of ionic strength.
A 0.2254 g sample of naphthalene (C8H10, 128.16 g/mol) was burned in a bomb calorimeter with a heat capacity of 2.18 kJ/K, and the temperature increased by 4.16°C. What is the molar enthalpy of combustion for this compound
What mass of silver was in the original solution? (Assume that all of the silver was precipitated out of solution by the reaction.)
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