The molar mass of CaCl2
is 110.98g/mol. How many molecules of CaCl2
are there in 4g?(1 point)
Responses
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
5 point 4 2 6 times 10 to the 21th power molecules
2.673×1026
molecules
To calculate the number of molecules in 4g of CaCl2, we first need to convert grams to moles using the molar mass of CaCl2:
4g CaCl2 * (1 mol CaCl2 / 110.98g CaCl2) = 0.035997 moles
Next, we use Avogadro's number (6.022 x 10^23 molecules/mol) to convert moles to molecules:
0.035997 moles * (6.022 x 10^23 molecules/mol) = 2.170 x 10^22 molecules
Therefore, the correct answer is 2.170 x 10^22 molecules.