Question

The molar mass of CaCl2 is 110.98g/mol. How many molecules of CaCl2 are there in 4g?(1 point) Responses 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 2.170 × 1022 molecules 5.426×1021 molecules

Answer 1

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

Moles = Mass / Molar Mass
Moles = 4g / 110.98g/mol
Moles = 0.036 mol

Now, you can use Avogadro's number to convert moles to molecules:

1 mol CaCl2 = 6.022 × 10^23 molecules CaCl2
0.036 mol CaCl2 = 0.036 * 6.022 × 10^23 molecules CaCl2
0.036 mol CaCl2 = 2.170 × 10^22 molecules CaCl2

Therefore, there are 2.170 × 10^22 molecules of CaCl2 in 4g.

So, the correct response is: 2.170 × 10^22 molecules