The molar mass of CaCl2

Question

is 110.98g/mol. How many molecules of CaCl2
are there in 4g?(1 point)
Responses

5.426×1021
molecules
5 point 4 2 6 times 10 to the 21th power molecules

2.673×1026
molecules
2 point 6 7 3 times 10 to the 26th power molecules

2.409×1024
molecules
2 point 4 0 9 times 10 to the 24th power molecules

2.170 × 1022
molecules

Answer 1

To find the number of molecules in 4g of CaCl2, we first need to calculate the number of moles of CaCl2 in 4g.

Moles = mass / molar mass
Moles = 4g / 110.98g/mol
Moles = 0.036 mol

Now, we can use Avogadro's number (6.022 x 10^23 molecules/mol) to convert moles to molecules:

Number of molecules = Moles x Avogadro's number
Number of molecules = 0.036 mol x 6.022 x 10^23 molecules/mol
Number of molecules = 2.170 x 10^22 molecules

Therefore, the correct answer is 2.170 x 10^22 molecules.