Скачать или смотреть Worked example: Calculating mass percent | AP Chemistry | Khan Academy

Keep going! Check out the next lesson and practice what you’re learning:
https://www.khanacademy.org/science/a...

Want to explore more? Check out the full Stoichiometry and the mole playlist here:    • Stoichiometry and the mole | Chemistry | K...  

To calculate the mass percent of an element in a compound, we divide the mass of the element in 1 mole of the compound by the compound's molar mass and multiply the result by 100. View more lessons or practice this subject at https://www.khanacademy.org/science/a...

Sections:
00:00 - Calculating percent by mass of carbon in glucose
00:41 - Assuming one mole of glucose
01:32 - Calculating mass of carbon in one mole
02:11 - Total molar mass of glucose
03:26 - Performing the calculation
04:48 - Considering significant figures
05:20 - Final answer: 40.00% carbon by mass

------------------

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

Donate or volunteer today! Donate here: https://www.khanacademy.org/donate?ut...

Volunteer here: https://www.khanacademy.org/contribut...