Question

How many moles of atoms are in 2.00 g of 13c?

Answer 1

There are 0.154 moles of atoms in 2.00 g of carbon-13.

Further Explanation:

Moles, Atomic mass and Molecular mass  

• 1 mole of a pure substance contains a mass that is equal to the relative atomic mass or molecular mass of the substance.

• Therefore; molar mass is given as grams per mole of a substance  

Hence;

Molar mass = mass of a substance/ Number of moles  

     g/mol = g /mole  

Thus;

• M = m/n; where M is the molar mass, m is the mass and n is the number of moles

• From this relationship we can therefore, calculate mass by multiplying the number of moles by molar mass of a substance.

That is; Mass = moles x molar mass  

• To calculate number of moles;

We have; n = m/M

Number of moles = Mass of the substance/ Molar mass

• In our case;

Mass = 2 g of Carbon-13  

Molar mass = 13.0 g/mol  

Since; Number of moles = Mass/ molar mass

Thus;

Moles = (2.0 g)/ (13.0 g/mol)

          = 0.154 moles  

Keywords: Moles, Molecular mass, relative atomic mass  

Learn more about:

• Relative atomic mass: brainly.com/question/11096711
• Moles calculation: brainly.com/question/9709257
• Molar mass: brainly.com/question/8992028

Level: High school  

Subject: Chemistry  

Topic: Moles  

Sub-topic: Moles, molecular mass and mass of a pure substance.

Answer 2

I think what '13C' means is the isotope of carbon with mass number of 13. Its mass is 13 amu. The unit amu is equivalent to g/mol. The average atomic mass of Carbon is actually 12. But since we are solving for this particular isotope, we use a molar mass of 13 g/mol.

2 g C-13 * 1 mol/13 g = 0.154 moles of C-13