How many water molecules are there in 5.18 g of Water? How many ammonia molecules are there in 3.25 g of ammonia?
How many Chlorine molecules are there in 2.25 g of Chlorine?
Calculate the mass of 2.2 x 10 23 Sodium Hydroxide formula units
Calculate the mass of 2.8 x 10 23 sulphuric acid formula units

≈

1.2

⋅

10

24

atoms of hydrogen

Explanation:

Water has a molar mass of

18.01528

g/mol

≈

18

g/mol

.

So, in

18

g

of water, there will be

18

g

18

g

/mol

=

1

mol

Since water has a chemical formula of

H

2

O

, there will be

2

moles of hydrogen in every mole of water.

In one mole of water, there will exist approximately

6.02

⋅

10

23

water molecules.

So, there will be a total of

6.02

⋅

10

23

⋅

2

≈

1.2

⋅

10

24

hydrogen atoms.

the answer is c. nacl

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