Calculate the number of moles of gas that must be decomposed to produce 45.0 liters of oxygen at STP

Enough of a monoprotic weak acid is dissolved in water to produce a 0.0172 m solution. if the ph of the resulting solution is 2.39 at 20 °c, determine the pka for the acid.

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?