Which sample contains the largest number of molecules?

a. 100 g of co2

b. 100 g of ch4

c. 100 g of cbr4

d. 100 g of chbr3?

The largest number of molecules is the same as the largest number of moles of this molecules

to calculate the number of moles you have to divide the mass by the molar mass

molar masses:

CO2: 44,01 g/mol

CH4: 16,04 g/mol

CBr4: 331,63 g/mol

CHBr3: 252,73 g/mol

largest nº of mol = 100 / (the smallest molar mass possible)

= 100/16,04

=6,23 moles

all other molecules would be smaller than 6,23 moles because the molar mass is so high.

The answer is B : 1 00 g of ch4