On a Clear Day at Sea Level, with a Temperature

question 70

Multiple Choice

On a clear day at sea level, with a temperature of 25 °C, the partial pressure of N₂ in air is 0.78 atm and the concentration of nitrogen in water is 5.3 × 10^-4 M. When the partial pressure of N₂ is ________ atm, the concentration in water is 2.0 × 10^-3 M.

• A)0.63
• B)0.68
• C)1.0
• D)3.0
• E)3.2

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Definitions:

Atom Contains

Atoms consist of a nucleus made of protons and neutrons, surrounded by electrons in orbital shells.

Atomic Number

The atomic number is equal to the number of protons (positively charged particles) in the nucleus of an atom.

Element

A pure chemical substance consisting of one type of atom distinguished by its atomic number.

Nucleus

The central and most important part of an atom, containing protons and neutrons and almost all of its mass.