Do protons and electrons have the same mass?

Which of the following compounds does not contain molecules? question 2 options: co2 h2 nacl h2o

If you add 5.00 ml of 0.100 m sodium hydroxide to 50.0 ml of acetate buffer that is 0.100 m in both acetic acid and sodium acetate, what is the ph of the resulting solution? acetic acid: ka = 1.8. x 10-5

Find the mass, in grams, of 5.00*10^23 molecules of f2