How many molecules are in 25 grams of NH3
To find out how many molecules are in 25 grams of NH3 (ammonia), you need to perform the following steps:
1. Determine the molar mass of NH3:
The molar mass is the mass of one mole of a substance. For NH3, the molar mass is calculated by adding up the atomic masses of nitrogen (N) and three hydrogen (H) atoms.
Atomic mass of nitrogen (N) = 14.01 g/mol
Atomic mass of hydrogen (H) = 1.01 g/mol
Molar mass of NH3 = (1x14.01) + (3x1.01) = 17.03 g/mol
2. Calculate the number of moles:
Moles = Mass / Molar mass
Moles = 25 g / 17.03 g/mol ≈ 1.47 moles
3. Determine Avogadro's number:
Avogadro's number is defined as 6.022 x 10^23 and represents the number of particles (atoms, molecules, ions) present in one mole of a substance.
4. Calculate the number of molecules:
Number of molecules = Number of moles x Avogadro's number
Number of molecules = 1.47 moles x 6.022 x 10^23 = 8.85 x 10^23 molecules
Therefore, there are approximately 8.85 x 10^23 molecules in 25 grams of NH3.
molecules=numbermoles*avagroNumber
= 25g/molmassNH3 * avagroNumber