Question

How many molecules are in 450 grams of Na2SO4?

Answer 1

To find the number of molecules in 450 grams of Na2SO4, first calculate the number of moles of Na2SO4 using its molar mass. Then, use Avogadro's number to convert moles to molecules. The answer is approximately 1.91 x 10^24 molecules.

Step-by-step explanation:

To determine the number of molecules in 450 grams of Na2SO4, we need to use the concept of moles. First, we need to calculate the number of moles of Na2SO4 using its molar mass. The molar mass of Na2SO4 is 22.99 g/mol for Na, 32.07 g/mol for S, and 16.00 g/mol for O.

Molar mass of Na2SO4 = (2 x 22.99 g/mol) + 32.07 g/mol + (4 x 16.00 g/mol) = 142.04 g/mol

Next, we can use the formula:

moles = mass / molar mass

moles of Na2SO4 = 450 g / 142.04 g/mol = 3.17 mol

Finally, we can use Avogadro's number, which is approximately 6.02 x 10^23 molecules/mol:

Number of molecules = moles of Na2SO4 x Avogadro's number = 3.17 mol x (6.02 x 10^23 molecules/mol) = 1.91 x 10^24 molecules

Answer 2

Answer: 1.90834 X 10 ^ 24

Step-by-step explanation:

Molar mass Na2SO4 = 23x2+ 32+16X4

= 142g/mol

Mass of Na2SO4 = 450g

Moles of Na2SO4 = mass/ molar mass

= 450g/142g/mol = 3.170 mol

Avogadro's number = 6.02X 10 ^ 23/mol

Number of molecules = moles X avogadro's number

= 3.17 X 6.02X 10^ 23 = 1.90834 X 10 ^ 24 molecules

Therefore the number of molecules of Na2SO4 is1.90834 X 10 ^ 24