Question

The molar mass of CaCl2




2
is 110.98g/mol. How many molecules of CaCl2




2
are there in 4g?(1 point)
Responses

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

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

2.170 × 1022
2.170

×

10
22
molecules
2.170 × 1022
2.170

×

10
22
molecules

5.426×1021
5.426
×
10
21
molecules

Answer 1

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

Molar mass of CaCl2 = 110.98 g/mol
Number of moles = Mass / Molar mass = 4g / 110.98 g/mol = 0.035996 moles

Now, we need to convert moles to molecules.
1 mole of any substance contains 6.022 x 10^23 molecules (Avogadro's number).

Number of molecules = Number of moles x Avogadro's number
= 0.035996 moles x 6.022 x 10^23 molecules/mol
= 2.170 x 10^22 molecules

Therefore, there are approximately 2.170 x 10^22 molecules of CaCl2 in 4g. The answer is 2.170 x 10^22 molecules.