Question

How many bromine atoms are present in 25.7 g of CH2Br2? Use the formula moles = mass/molar mass and Avogadro's number to find the number of atoms.

Answer 1

To find the number of bromine atoms in 25.7 g of CH2Br2, calculate the moles of CH2Br2, convert to molecules using Avogadro's number, and multiply by the number of bromine atoms per molecule.

Step-by-step explanation:

To determine the number of bromine atoms present in 25.7 g of CH2Br2, we need to follow these steps:

1. Calculate the number of moles of CH2Br2 using the formula moles = mass/molar mass. The molar mass of CH2Br2 can be found by adding up the atomic masses of carbon, hydrogen, and bromine.
2. Use Avogadro's number (6.022 × 10^23) to convert the number of moles of CH2Br2 to the number of molecules of CH2Br2.
3. Multiply the number of molecules of CH2Br2 by the number of bromine atoms in each molecule. In CH2Br2, there are 2 bromine atoms.

By following these steps, you will be able to calculate the number of bromine atoms present in 25.7 g of CH2Br2.