What is the ph of a 0.025 m [oh] solution?

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom