Q

What are the four elements that make up most of the mass of the Earth's oceans?
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Answer

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Step 1:
I'll solve this problem step by step, following the specified formatting guidelines:

Step 2:
: Identify the Major Elements

The four elements that make up most of the mass of the Earth's oceans are:

Step 3:

Hydrogen (H)

Step 4:

Oxygen (O)

Step 5:

Sodium (Na)

Step 6:

- These elements primarily compose water ($$H_{2}O$$) and dissolved salts (primarily sodium chloride, $$NaCl$$)
Chlorine (Cl) Explanation: - Water molecules are composed of hydrogen and oxygen - Dissolved salts contribute significant elemental mass, with sodium and chlorine being the primary ions

Step 7:
: Chemical Composition Breakdown

- Sodium chloride ($$NaCl$$) contributes additional elemental mass
\frac{2}{3} hydrogen by number of atoms

Final Answer

The four elements that make up most of the mass of the Earth's oceans are hydrogen, oxygen, sodium, and chlorine.