The molar mass of BF^3 is 67.81 g/mol. how many molecules of BF^3 are there in 2 g?
A. 4.084 x 10^25
B. 8.881 x 10^21
C. 1.204 x 10^24
D. 1.776 x 10^22
To find the number of molecules of BF3 in 2g, we first need to calculate the number of moles of BF3 in 2g.
Moles = mass / molar mass
Moles = 2g / 67.81 g/mol
Moles = 0.0295 mol
Now, we use Avogadro's number to convert moles to molecules.
1 mol of any substance contains 6.022 x 10^23 molecules
Number of molecules = moles x Avogadro's number
Number of molecules = 0.0295 mol x 6.022 x 10^23 molecules/mol
Number of molecules = 1.776 x 10^22 molecules
Therefore, the answer is D. 1.776 x 10^22