How many molecules are in 65.8 g of Cl2 ? Answer in units of molec.?

Question

please no web site links

Answer 1

molar mass of Cl =35.45 g
molar mass of Cl2 = 70.9 g

70.9g correspond to 6.022*10^23 molecules
1g to 6.022 *10^23/70.9
and 65.8

65.8*6.022*10^23/70.9 =5.588*10^23 molecules

Answer 2

Cl molar mass = 35.47g/mole
Cl2 = 70.94 g/mole

There are 6.022 x 10^23 molecules/mole

(65.8 g)(1mole/70.94 g)(6.022 x 10^23 molecules/mole)

= [(65.8)(6.022 x 10^23)]/70.94 molecules

= 5.59 x 10^23 molecules

Answer 3

cl has a MW of about 35g/mol, so cl2 is about 70g/mol.

There are then 6.02e23 molecules of Cl2 per 70g.

So

65.8g * 6.02e23 molecules/70 g = ?? don't have a calculator.

Answer 4

Find no. of moles = 65.8/(35.5x2) =0.9268 mol
Then find no. of molecules= 0.9268 x Avogadro's constant
= 0.9268 x (6.02 x 10^23)
= 5.58 x 10^23

Answer 5

n=number of mole
m=mass of sample in grams
M=molecular mass

n=m/M
n=65.8/71
n=0.93 mol

#=number of particles
A=Avagadro's number=6.02x10^23

n=#/A
0.93=#/6.02x10^23
#=5.58x10^23 molecules