Chemistry Unit 1 - moles

[Electroflame1395]

Hey!

A sample in a gar jar contains two moles of common fuel ethane (C2H6).
a) What is the relative molar mass of ethane?
b) What is the total mass of gar in the jar, in grams?
c) How many molecules of ethane are there?
d) How many moles of carbom atoms are there?
e) What is the total number of atoms in the sample?

These are the answers I got for
a) 30 g/mol
b) 60 g
c) ?
d) 4 moles
e) ?

Thanks

 

[IndefatigableLover]

Hey!

A sample in a gar jar contains two moles of common fuel ethane (C2H6).
a) What is the relative molar mass of ethane?
b) What is the total mass of gar in the jar, in grams?
c) How many molecules of ethane are there?
d) How many moles of carbom atoms are there?
e) What is the total number of atoms in the sample?

These are the answers I got for
a) 30 g/mol
b) 60 g
c) ?
d) 4 moles
e) ?

Thanks

 

All your answers seem right.. I'll just fill in on the others

C). If there are two moles then we simply use Avogadro's Number to find how many molecules are present in two moles of ethane.
Therefore, 2mol x 6.02 x 10^23 = 1.204x10^24 molecules.

e). I'm pretty sure you just count how many atoms are there in the sample so in C2H6, there would be 8 atoms in the sample