Question

The molar mass of silicon (

S
i
SiS, i) is
28. 09

g
/
m
o
l
28. 09 g/mol28, point, 09, space, g, slash, m, o, l. Calculate the number of atoms in a
92. 8

m
g
92. 8 mg92, point, 8, space, m, g sample of
S
i
SiS, i

Answer 1

Step-by-step explanation:

First, we need to convert the mass of the sample from milligrams to grams:

92.8 mg = 0.0928 g

Next, we need to calculate the number of moles of Si present in the sample:

number of moles = mass / molar mass

number of moles of Si = 0.0928 g / 28.09 g/mol = 0.0033 mol

Finally, we can use Avogadro's number to calculate the number of atoms:

number of atoms = number of moles x Avogadro's number

number of atoms of Si = 0.0033 mol x 6.022 x 10^23/mol = 1.98 x 10^21 atoms

Therefore, there are approximately 1.98 x 10^21 atoms of Si in a 92.8 mg sample.