Your presentation included a lot of great information about moles. I did not know what one was before seeing this. The quizzes offer a great way for the students to check their learning. Seeing examples of the problems is a great way for the students to learn how to do the conversion. I am assuming there is some prior knowledge involved with the terms. Overall, the presentation does a great job of teaching the concept, reviewing the information with quizzes, and building to the end. Very good use of scaffolding.
Adding some more sound to the presentation would liven it up for the students. Also, a video of someone doing the calcuation by hand would prove to be useful as well. Following the UDL guidelines, some type of audio support would be useful for students with vision impairments. For the last two questions, make all the multiple choice answers the same format, it will force the students to find the correct answer.