Question

The molar mass of gallium (

G
a
GaG, a) is
69. 72

g
/
m
o
l
69. 72 g/mol69, point, 72, space, g, slash, m, o, l. Calculate the number of atoms in a
27. 2

m
g
27. 2 mg27, point, 2, space, m, g sample of
G
a
GaG, a

Answer 1

Step-by-step explanation:

To calculate the number of atoms in the sample of gallium, we first need to determine the number of moles present in 27.2 mg of gallium. We can use the molar mass of gallium to convert mass to moles:

1 mol Ga = 69.72 g

x mol Ga = 27.2 mg

x mol Ga = 0.000390 mol Ga

Next, we can use Avogadro's number (6.022 x 10^23 atoms/mol) to convert the number of moles to the number of atoms:

0.000390 mol Ga * 6.022 x 10^23 atoms/mol = 2.35 x 10^20 atoms

Therefore, there are 2.35 x 10^20 atoms of gallium in a 27.2 mg sample.