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If a gas has 2.7 × 10^10 molecules in one cubic centimeter, how many moles of the gas are in one cubic meter?
The probe of the pH meter shown here is sitting in a beaker that contains a clear liquid. (a) You are told the liquid is pure water, a solution of HCl(aq), or a solution of KOH(aq). Which one is it? (b) If the liquid is one of the solutions, what is its molarity? (c) Why is the temperature given on the pH meter?