[Dominik Giel] 09:56:53 Let's consider an example and find the amount of substance. [Dominik Giel] 09:56:59 Imagine that we have 25 kg of carbon. [Dominik Giel] 09:57:06 So, miss, is 25 kg. [Dominik Giel] 09:57:12 And we have to find the amount of substance or amount of carbon. [Dominik Giel] 09:57:18 For this we need the carbon molar mass is, and it's the will gramophone. [Dominik Giel] 09:57:31 Or 0 point 0 1 2 kg. Good morning. [Dominik Giel] 09:57:42 And of course we have to use it equation for amount of substance. [Dominik Giel] 09:57:47 And it's we mass, divided by molar mess. [Dominik Giel] 09:57:53 So we have 25 kg divided by 0 point 0 1 2. [Dominik Giel] 09:58:02 And as a result, we have 2,083. [Dominik Giel] 09:58:17 It's an amount of thousands of 25 kg of okay?