AP Chem questions about phosgene

Question

AP Chemistry:

a) what is the molar mass of phosgene (COC12)

b)how many moles of phosgene are in a sample of phosgene having a mass of 2.00 grams?

c) How many phosgene molecules are present in 2.00 grams of phosgene?

d) How many chlorine atoms are present in 2.00 grams of phosgene?

Answer 1

what is the molar mass of phosgene (COCl2)

12.01 + 16.00 + 12(35.45) = 98.92 g/mol

 

how many moles of phosgene are in a sample of phosgene having a mass of 2.00 grams?

2.00 g  x  1 mol/98.82g = .020 moles

 

How many phosgene molecules are present in 2.00 grams of phosgene?

 

2.00 g x (1 mol/98.82g) x (6.022 x 10^23 molecules/1 mole) = .122 X 10^23 molecules

 

How many chlorine atoms are present in 2.00 grams of phosgene?

 

2.00 g x (1 mol/98.82g) x (6.022 x 10^23 molecules/1 mole) x (2 Cl/1COCl2) = .244 atoms of Cl