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

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

Hence;

Molar mass = mass of a substance/ Number of moles  

     g/mol = g /mole  

Thus;

That is; Mass = moles x molar mass  

We have; n = m/M

Number of moles = Mass of the substance/ Molar mass

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  

Level: High school  

Subject: Chemistry  

Topic: Moles  

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

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation:

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.