21 Chemistry -- Stoichiometry

Calculate mass in gram of a. two atom of carbonb. three molecules of hydrogen

Calculate mass in gram of 
a. two atom of carbon

b. three molecules of hydrogen

Two atoms of Carbon:

1 mole of carbon = 12g
1 mole of carbon = 6.022 x 1023 carbon atom

Thus,
6.022 x 1023 carbon atom has mass 12g
2 carbon atom has mass = 3.98 x 10-23 g carbon.

Three molecules of hydrogen:

1 mole of hydrogen molecule = 2g
1 mole of hydrogen molecule = 6.022 x 1023 hydrogen molecule

Thus,
6.022 x 1023 hydrogen molecule has mass 2g hydrogen.

3 hydrogen molecules has mass = 9.96 x 10-24g

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