# How many atoms of oxygen are present in 300 grams of calcium

• NeerajKarthi
In summary, to find the number of atoms of oxygen present in 300 grams of calcium carbonate, we need to use the molar mass of CaCO3 (100g) and the concept of the mole. By converting 300 grams of CaCO3 to moles, we can then use the mole ratio to determine the number of moles of oxygen present. Finally, we can use Avogadro's number to convert moles to atoms.

## Homework Statement

How many atoms of oxygen are present in 300 grams of calcium carbonate?

molar mass of CaCO3 = 100g

## The Attempt at a Solution

I don't know how to proceed.
Can anyone please help me out by giving the forulae or steps on how to do this problem.

NeerajKarthi said:

## Homework Statement

How many atoms of oxygen are present in 300 grams of calcium carbonate?

molar mass of CaCO3 = 100g

## The Attempt at a Solution

I don't know how to proceed.
Can anyone please help me out by giving the forulae or steps on how to do this problem.
Have you studied the concept of the mole in chemistry?

http://www.bbc.co.uk/education/guides/zysk7ty/revision/1

## 1. How do you calculate the number of atoms of oxygen in 300 grams of calcium?

To calculate the number of atoms of oxygen in 300 grams of calcium, you need to determine the molar mass of calcium and oxygen. Then, use the ratio of their molar masses and the given mass of calcium to calculate the number of moles of calcium. Finally, use the mole ratio from the chemical formula of calcium oxide (CaO) to determine the number of moles of oxygen. Multiply this by Avogadro's number (6.022 x 10^23) to get the number of atoms of oxygen.

## 2. What is the molar mass of calcium and oxygen?

The molar mass of calcium is 40.08 g/mol and the molar mass of oxygen is 16.00 g/mol.

## 3. What is the ratio of molar masses between calcium and oxygen in calcium oxide?

The ratio of molar masses between calcium and oxygen in calcium oxide is 2:1. This means that for every 2 moles of calcium, there is 1 mole of oxygen in the compound.

## 4. What is Avogadro's number and why is it important in this calculation?

Avogadro's number is 6.022 x 10^23 and it represents the number of particles (atoms, molecules, etc.) in one mole of a substance. In this calculation, we use Avogadro's number to convert the number of moles of oxygen to the number of atoms of oxygen.

## 5. Can this calculation be used for any compound?

Yes, this calculation can be used for any compound as long as you know the molar mass of the elements present in the compound and the chemical formula. You can use the same process to calculate the number of atoms of any element in a given mass of a compound.