A 0.517 g sample of impure oxalic acid is dissolved in water and an acid-base indicator added. The sample requires 17.24 mL of 0.243 M NaOH to reach the equivalence point. Calculate the mass and mass percent of oxalic acid in the sample?​

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.