A chemist is using a solution of HNO3 that has a pH of 3.75. What is [H+] for the solution?
x 10 M
n =

Which of the following units is not an official si unit

One similarity and one difference between an element and a mixture of elements

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3