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Discover Questions

The weak acid HQ has a pKa of 4.89. Calculate the [H3O+] of 0.020 mol/L HQ.? 4. Calculate the formula weight (mass) of K2Cr2O7. -g/mole help please!!? Calculate the number of grams in 1.15 x 10^21 molecules of P2O5.
Choices: 7.43 x 104 g 27.1 g 0.271 g 1.35 x 10-5g? 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? YOu have a solution of .250 M NaCl. If you boil away 2/3 of the volume of water, what is the concentration of this solution?

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