[carlson55]

If some on could help me out on this I would greatly appreciate it.
wich of the following has the fewer moles of carbon present and show there calculations.
a. 100 grams of CaCO3
b. 0.5 moles of CCl4

[macman104]

If some on could help me out on this I would greatly appreciate it.
wich of the following has the fewer moles of carbon present and show there calculations.
a. 100 grams of CaCO3
b. 0.5 moles of CCl4

Can you calculate how many moles of CaCO₃ 100 grams is?

If you have 1 mole of CCl₄ how many moles of C would you have in it?  If you have 0.5 moles of CCl₄.

[carlson55]

I was able to find the answer
100 grams=1mole of CaCO3
1molevs .5 with the carbon element same in each

[macman104]

1 mole vs .5 of carbon, how is that the same in each?

You are correct, 100 grams is 1 mole of CaCO3, but your final answer is not correct.

[Fusiform]

Well firstly, work out the number of moles of CaCO₃.

N (number of moles) = m (mass) / Mr (molar mass)
This is trivial... 100/100 = 1 mol of CaCO₃

So you have:
1 mol CaCO₃
0.5 mol CCl₃

Work out the percentage composition of carbon in each compound with respect to the molar mass.
In  1 mol CaCO₃, the percentage of carbon is 12%
In 0.5 mol CCl₃, the percentage of carbon is 7.8%

Now you can work out precisely how much carbon is present in each of the respective compounds.

[macman104]

Well firstly, work out the number of moles of CaCO3.
N (number of moles) = m (mass) / Mr (molar mass)
This is trivial... 100/100 = 1 mol of CaCO3
So you have:
1 mol CaCO3
0.5 mol CCl3[
Work out the percentage composition of carbon in each compound with respect to the molar mass.
In  1 mol CaCO3, the percentage of carbon is 12%
In 0.5 mol CCl3, the percentage of carbon is 7.8%
Now you can work out precisely how much carbon is present in each of the respective compounds.

The second part of your solution is not necessary.  1 mole of HCl has 1 mole of H and 1 mole of Cl, no need to calculate weight percentages.