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Lecture 5 8-31-11

# Lecture 5 8-31-11 - Lecture Topics Mass Moles and MW Mass...

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1 Mass, Moles, and MW Density, Specific Gravity, Specific Volume Types of Pressures Chevron Phillips Mentors Office SEC Room S-130 Lecture Topics Sophomore Game Night Thursday Sept. 8th Time: 6 – 8 pm Room: Willoughby Lounge 5 Extra Credit Points for all who attend and sign on. Mass, Moles, and MW, What is a mole? SI definition. 1 g-mole = 6.02 x 10 23 molecules AE definition. mole lb 1 molecules 27.3x10 lb 1 g 454 mole 1g molecules 6.02x10 25 m 23 = Definitions weight molecular g in mass mole g = weight molecular lb in mass mole lb = To convert moles to mass Mass in g = (mol. Wt)(g-mol) Mass in lb = (mol. Wt)(lb-mol) What is the molecular weight of CaCO 3 ? How many g-mol are in 10 g of CaCO 3 ? How many lb-mol are in 20 lb of CaCO 3 ? How many g are in 2 lb-mol of CaCO 3 ? Example Problem What is the molecular weight of CaCO 3 ? How many g-mol are in 10 g of CaCO 3 ? How many lb-mol are in 20 lb of CaCO 3 ? How many g are in 2 lb-mol of CaCO 3 ? MW = 40.08 g g mol + 12.01 g g mol + 3( 16 g g mol ) = 100.09 g CaCO 3 g mol 10 g CaCO 3 1.0 g mol CaCO 3 100.09 g CaCO 3 = 0.0999 g mol 20 lb CaCO 3 1.0 lb mol CaCO 3 100.09 lb CaCO 3 = 0.200 lb mol 2.0 lb mol CaCO 3 100.09 lb CaCO

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Lecture 5 8-31-11 - Lecture Topics Mass Moles and MW Mass...

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