What mass of gold (au) contains the same number of atoms as 7.72g of aluminum (al) ? in units of g
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55.16 gram of gold contain same number of atoms as 7.72 g Al contain.

Explanation:

Given data:

Mass of Al = 7.72 g

Mass of gold contain same number of atoms as 7.72 g Al contain = ?

Solution:

First of all we will determine the atoms of Al in 7.72 g.

Number of moles = mass/ molar mass

Number of moles = 7.72 g / 27 g/mol

Number of moles = 0.286 mol

Number of atoms:

0.286 mol × 6.022 ×10²³ atoms / 1 mol

1.72 ×10²³ atoms

Now we determine the mass of gold that contain 1.72 ×10²³ atoms:

1 mol =  6.022 ×10²³ atoms

1.72 ×10²³ atoms× 1 mol / 6.022 ×10²³ atoms = 0.28 mol

Mass of gold = number of moles × molar mass

Mass of gold =0.28 mol × 197 g/mol

Mass of gold = 55.16 g

samuel de champlain. in 1608, king henry iv sponsored pierre dugua, sieur de mons and samuel de champlain as founders of the city of quebec with 28 men. this was the second permanent french settlement in the colony of canada.

the right answer is c i just did the question.