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How much heat is needed to raise the temperature of 85g of water by 84oC?joules? Calculate the limit and explain why it does not exist? The weak acid HQ has a pKa of 4.89. Calculate the [H3O+] of 0.020 mol/L HQ.? Calculatethevalueofkaforhc2h3o2in0.150msolutioniftheh3o+concentrationofthesolution isfoundtobe1.64 ×10to -3m.hc2 h3o2+h2o -m->c2h3o2- +h3o+? 4. Calculate the formula weight (mass) of K2Cr2O7. -g/mole help please!!?