1 / 9

Warm-Up: To be turned in

Warm-Up: To be turned in. What is the percent composition of N and O in NO 2 ?. Moles and Molar Mass. What is a mole?. SI unit for the amount of a substance A system of counting atoms/ molecules Much like we count eggs in dozens. Avogadro’s Number. Named after Amedeo Avogadro 6.02x10 23

kenna
Download Presentation

Warm-Up: To be turned in

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Warm-Up: To be turned in • What is the percent composition of N and O in NO2?

  2. Moles and Molar Mass

  3. What is a mole? • SI unit for the amount of a substance • A system of counting atoms/ molecules • Much like we count eggs in dozens

  4. Avogadro’s Number • Named after Amedeo Avogadro • 6.02x1023 • Number of atoms/ molecules in one mole of substance • If every person living on Earth worked to count the atoms in one mole of an element, and if each person counted continuously at a rate of one atom per second, it would take about 4 million years for all the atoms to be counted.

  5. Molar Mass • The mass of a substance that contains exactly 6.02x1023 particles of that substance. • Numerical value is the same as the formula mass • Unit: g/mol • Ex: mol mass of C= 12.01g/mol; mol mass of O= 16.00g/mol

  6. Converting from g to mol • # of mol= g x 1 _ molar mass Ex: 24.02 g of Carbon= ? mol 24.02g x 1mol = 2.00 mol 12.01g

  7. Practice 64.14g of sulfur is equal to how many moles? A sample is No has a mass of 90g. How many moles is this?

  8. Converting from mol to g • # of g= mol x molar mass Ex: 1.5 mol of He= ? g 1.5mol x 4.00g = 6.0 g He 1 mol

  9. Practice What is the mass of 2.5 mol of CO2? What is the mass of 5 mol of Ne?

More Related