Question

100 POINTS 2H2O
How many hydrogen atoms are represented by this much water?
A) 1
B) 2
C) 4
D) 6

Answer 1

-- H₂O is a single molecule of water.  It's made of two Hydrogen atoms and one Oxygen atom.

-- 2 H₂O is two molecules of water.  Between them, they have a total of four Hydrogen atoms and two Oxygen atoms. (C)

Answer 2

The number of hydrogen atoms in 2H₂O  is 4 atoms.

The compound is water . And the water can be interpreted as 2 molecules of water.

H₂O → Water

2H₂O →  2 molecules of water.

The number of hydrogen atoms in 2 molecules of water is the individual number of hydrogen atoms in the compound.

Therefore, the number of hydrogen atom in the compounds is as follows:

2H₂O → 2 × 2 = 4 atoms of hydrogen.

The number of hydrogen atom is 4.

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