In this video, we will focus on determining the number of atoms in 3 different elements of the same mass. Hence, we can safely say that, to determine the number of particles, we can use this formula: number of particles = number of moles x 6 x 10 23 In this Video Since 1 mole of substance contains 6 x 10 23 particles, 2 moles of substance contains 2 x 6 x 10 23 particles.0.5 moles of substance contains 0.5 x 6 x 10 23 particles. Formula: number of particles = number of moles x 6 x 10 23 The value 6 x 10 23 is called Avogadro’s constant or Avogadro’s number.Įqual number of moles of substances contain the same number of particles. In 1 mol of hydrogen gas, 6 x 10 23 molecules have 2 x 6 x 10 23 hydrogen atoms. This is because 1 hydrogen molecule has 2 atoms. To determine its number of atoms, we need to multiply the number of molecules by 2. If we focus on hydrogen gas, then 1 mol of hydrogen gas has 6 x 10 23 hydrogen molecules. The particles can be atoms, molecules, ions or even electrons, depending on what substance we are referring to.įor example, if we focus on helium, then we are talking about helium atoms. One mole of a substance has 6 x 10 23 particles. Hence, chemist use a unit – mole – to count particles. There are so many of them it is pretty impossible to count them. Also, they must be confident with calculating the number of particles from the number of moles of particles and vice versa. Iodine (I 2) iron (Fe) oxygen (O 2) Syllabus ObjectivesĪt O levels, students must be able to perform calculations involving the number of moles, mass and molar mass of a substance. Which substance contains the greatest number of atoms in 1 g?
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |