Find the mass of 3.27 x 10^23 molecules of H2SO4. Use 3 significant digits
and put the units.

Approximately .

Explanation:

Lookup Avogadro's Number: (three significant figures.)

Lookup the relative atomic mass of , , and on a modern periodic table:

(For example, the relative atomic mass of is means that the mass of one mole of atoms would be approximately grams on average.)

The question counted the number of molecules without using any unit. Avogadro's Number helps convert the unit of that count to moles.

Each mole of molecules includes exactly of these molecules.

molecules would correspond to of such molecules.

(Keep more significant figures than required during intermediary steps.)

The formula mass of gives the mass of each mole of molecules. The value of the formula mass could be calculated using the relative atomic mass of each element:

.

Calculate the mass of approximately of :

.

(Rounded to three significant figures.)

b. atoms in metallic solids are not arranged in a regular pattern

explanation: