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Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 3 to n = 1 in Jewels? The weak acid HQ has a pKa of 4.89. Calculate the [H3O+] of 0.020 mol/L HQ.? Student measures a pressure of 775mmHg for a volume of 565 mL. Calculate the pressure for the same experiment with a volume of 585 mL.? Calculatethevalueofkaforhc2h3o2in0.150msolutioniftheh3o+concentrationofthesolution isfoundtobe1.64 ×10to -3m.hc2 h3o2+h2o -m->c2h3o2- +h3o+? How much heat (in joules) is needed to raise the temperature of 257g of ethanol by 49.1°C?