for a given substance what information links mass to moles? number of particles
moles = grams/molar mass
There are 6.022 x 10^23 molecules (particles) in a mole.
Use the equation below to answer the questions
that follow.
Br2 + Cl 2 → 2BrCl
a. How many moles of BrCl form when
2.74 mol Cl2 react with excess Br2?
b. How many grams of BrCl form when
239.7 g Cl2 react with excess Br2?
c. How many grams of Br2 are needed to
react with 4.53 × 1025 molecules Cl2?
To link mass to moles for a given substance, you need to know its molar mass. The molar mass is the mass of one mole of that substance and is typically expressed in grams per mole (g/mol).
The relationship between mass, moles, and the molar mass of a substance can be calculated using the following equation:
Moles = Mass / Molar Mass
Once you know the mass of the substance, divide it by the molar mass to obtain the number of moles.
To connect the number of moles to the number of particles, you need to know Avogadro's number. Avogadro's number represents the number of particles (atoms, molecules, ions) present in one mole of a substance. It is approximately 6.022 x 10^23 particles/mol.
To find the number of particles (N) from the number of moles (n), you can use the equation:
N = n x Avogadro's number
By multiplying the number of moles by Avogadro's number, you can determine the number of particles in a given substance.