Chemistry How to Calculate Moles of Carbon and Oxygen in a Given Amount of CaCO3?

[Sace Ver]

Homework Statement

In 0.50 moles of CaCO₃ how many moles of carbon are present? How many moles of oxygen are present?

Given:
0.50 moles of CaCO₃
Molar mass is 100.9 g/mol

Homework Equations

n=m/M

The Attempt at a Solution

I'm not quite sure how to do this question would I begin by finding the mass?

Because if so the mass of CaCO₃ would be 50.45 g I'm assuming because m=nM.

But then I do not know where to go from there would I find the mass of each of them?

 

[SteamKing]

Homework Statement

In 0.50 moles of CaCO₃ how many moles of carbon are present? How many moles of oxygen are present?

Given:
0.50 moles of CaCO₃
Molar mass is 100.9 g/mol

Homework Equations

n=m/M

The Attempt at a Solution

I'm not quite sure how to do this question would I begin by finding the mass?

Because if so the mass of CaCO₃ would be 50.45 g I'm assuming because m=nM.

But then I do not know where to go from there would I find the mass of each of them?

You don't need to know the mass of CaCO₃ to figure out how many moles of each constituent there are. You just need to know how many moles of CaCO₃ you start with.

Look at it this way. How many molecules of a substance are in one mole of that substance?

If you know there is one atom of element X in each molecule, how many moles of X will there be for each mole of the substance?

 

[Sace Ver]

You don't need to know the mass of CaCO₃ to figure out how many moles of each constituent there are. You just need to know how many moles of CaCO₃ you start with.

Look at it this way. How many molecules of a substance are in one mole of that substance?

If you know there is one atom of element X in each molecule, how many moles of X will there be for each mole of the substance?

1 molecule of substance is in one mole of a substance?

There will be 1 mole of C and 3 moles of O ?

 

[SteamKing]

1 molecule of substance is in one mole of a substance?

You need to review the definition of mole:

https://en.wikipedia.org/wiki/Mole_(unit)

There will be 1 mole of C and 3 moles of O ?

Yes, but not because you think there is one molecule in one mole.

 

[Sace Ver]

You need to review the definition of mole:

https://en.wikipedia.org/wiki/Mole_(unit)
Yes, but not because you think there is one molecule in one mole.

Will I have to use Avogadro's constant to get my answer?

 

[SteamKing]

Will I have to use Avogadro's constant to get my answer?

No, but you still need to understand the concept of what a mole is.

A mole is a standard number of molecules of a substance. Think of it as being analogous to what a dozen is. It doesn't matter what we are talking about, be it a dozen doughnuts, or a dozen cars, or a dozen dogs, a dozen means twelve somethings.

Same thing with moles. One mole of a substance contains a standard number of somethings, in this case that number is waaaay more than 12. It is, in fact Avogadro's number of molecules in one mole of a substance.

Now, if one molecule of CaCO₃ contains one Calcium atom, one Carbon atom, and three Oxygen atoms, then if we collected a dozen molecules of CaCO₃, how many Calcium atoms, Carbon atoms, and Oxygen atoms would we have?
If we collected 10,000 molecules?
One million molecules?
An Avogadro's number of molecules?

Does the ratio of Calcium atoms to Carbon atoms to Oxygen atoms change depending on how many molecules of one substance are collected?

 

[Sace Ver]

No, but you still need to understand the concept of what a mole is.

A mole is a standard number of molecules of a substance. Think of it as being analogous to what a dozen is. It doesn't matter what we are talking about, be it a dozen doughnuts, or a dozen cars, or a dozen dogs, a dozen means twelve somethings.

Same thing with moles. One mole of a substance contains a standard number of somethings, in this case that number is waaaay more than 12. It is, in fact Avogadro's number of molecules in one mole of a substance.

Now, if one molecule of CaCO₃ contains one Calcium atom, one Carbon atom, and three Oxygen atoms, then if we collected a dozen molecules of CaCO₃, how many Calcium atoms, Carbon atoms, and Oxygen atoms would we have?
If we collected 10,000 molecules?
One million molecules?
An Avogadro's number of molecules?

Does the ratio of Calcium atoms to Carbon atoms to Oxygen atoms change depending on how many molecules of one substance are collected?

The ratio doesn't change, right?

 

[SteamKing]

The ratio doesn't change, right?

Right.

 

[Sace Ver]

Right.

Okay I tried this question once again.
Would I first find the number of carbon and oxygen and then find the mole?

 

[Sace Ver]

Right.

The answer would be 0.5 mol of carbon and 1.5 mol of oxygen? Would that be correct?

 

[SteamKing]

The answer would be 0.5 mol of carbon and 1.5 mol of oxygen? Would that be correct?

Yes.