Question

How many moles of sulfur atoms are there in 64 g of S8?

a. 2.0 moles
b. 1.3 moles
c. 0.56 moles
d. 0.25 moles

Answer 1

There are 0.25 moles of sulfur atoms in 64 g of S8.

Step-by-step explanation:

To determine the number of moles of sulfur atoms in 64 g of S8, we need to use the molar mass of S8 and the concept of moles. The molar mass of S8 is 8 times the molar mass of a single sulfur atom. The molar mass of sulfur is 32 g/mol, so the molar mass of S8 is 8 * 32 = 256 g/mol.

Now, using the given mass of 64 g, we can calculate the number of moles of S8:

moles = mass / molar mass = 64 g / 256 g/mol = 0.25 moles

Therefore, there are 0.25 moles of sulfur atoms in 64 g of S8.

Answer 2

To find the moles of sulfur atoms in 64 g of S8, calculate the molar mass of S8, then divide the given mass by this molar mass, and finally multiply by 8 since S8 contains 8 sulfur atoms per molecule. The result is 2.0 moles. So the correct option is a.

Step-by-step explanation:

To find the number of moles of sulfur atoms in 64 g of S8, we first need to calculate the molar mass of a molecule of S8. Since the molar mass of atomic sulfur (S) is 32 g/mol, the molar mass of an S8 molecule is 8 * 32 g/mol = 256 g/mol.

To find the moles of S8, we divide the mass of S8 by its molar mass:

64 g S8 / 256 g/mol S8 = 0.25 moles of S8.

Since each mole of S8 contains 8 moles of sulfur atoms, we multiply the moles of S8 by 8:

0.25 moles of S8 * 8 = 2.0 moles of sulfur atoms.

So, the answer is (a) 2.0 moles.