Bellwork What is the gram molar mass of methane? Methane’s formula is CH4.

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Presentation transcript:

Bellwork What is the gram molar mass of methane? Methane’s formula is CH4

CHAPTER 7 THE MOLE Part 2

Mole –> Mass Conversions New Conversion factor! 1 mol = gfm

Find the mass in grams of 3.32 mol of K. 3.32 mol K 39.1 g K 1 mol K = 1.30 x 102 g K

Find the mass in grams of 3.32 mol of K.

Find the mass in grams of 15.0 mol of sulfuric acid. H2SO4 H 2 x 1.0 = 2.0 S 1 x 32.1 = 32.1 O 4 x 16.0 = 64.0 98.1 g 15.0 mol H2SO4 98.1 g H2SO4 1 mol H2SO4 = 1470 g H2SO4

Find the mass in grams of 15.0 mol of sulfuric acid.

Find the number of moles in 11.0 g of methane (CH4). CH4 = (12.0g + 4.0g = 16.0 g) 11.0 g CH4 1 mol CH4 16.0 g CH4 = 0.688 mol CH4 What was Avogadro’s favorite Indian tribe? The MOLEHICANS

Find the number of moles in 11.0 g of methane (CH4).

Molti-Step Mole Problems! Calculate the number of molecules present in 4.29 g of nitrogen dioxide (NO2). 4.29 g NO2 1 mol NO2 6.02x1023 m.c. NO2= 46.0 g NO2 1 mol NO2 = 5.61x1022 molecules NO2

Molti-Step Mole Problems! Calculate the number of molecules present in 4.29 g of nitrogen dioxide (NO2).

Molti-Step Mole Problems! Calculate the number of moles of sulfur atoms present in 2.01 g of sodium sulfide (Na2S). 2.01 g Na2S 1 mol Na2S 1 mol S atoms 78.1 g Na2S 1 mol Na2S = 0.0257 mol S atoms

Molti-Step Mole Problems! Calculate the mass in grams of 2.49 x 1020 carbon dioxide (CO2) molecules.

Molti-Step Mole Problems! Calculate the mass in grams of 2.49 x 1020 carbon dioxide (CO2) molecules. 2.49 x 1020 CO2 m.c. 1 mol CO2 44.0 g CO2 6.02x1023 m.c. CO2 1 mol CO2 = 1.82 x 10-2 grams CO2

Molti-Step Mole Problems!

Molti-Step Mole Problems! Calculate the grams of carbon in 12.2 mol sucrose, C12H22O11. 12.2 mol C12H22O11 12 mol C atoms 12.0 g C 1 mol C12H22O11 1 mol C atoms = 1.76 x 103 g carbon

Molti-Step Mole Problems! Calculate the grams of carbon in 12.2 mol sucrose, C12H22O11.

Molar Volume of a Gas The volume of a gas is usually measured at 0oC and 1 atmosphere of pressure. This is called standard temperature and pressure (STP). Know these values!

-At STP, one mole of any gas has a volume of 22 -At STP, one mole of any gas has a volume of 22.4 L which is called the molar volume of a gas and contains 6.02 x 1023 particles of the gas. -22.4 L of a gas has a mass equal to the gfm of the gas. 1 mol = 22.4L = 6.02 x 1023 particles = gfm Must know!

New conversion factor. 1 mol of any gas at STP = 22 New conversion factor! 1 mol of any gas at STP = 22.4 L (for gases only)

What is the volume (liters) at STP of 0.960 mol of methane, CH4? 0.960 mol CH4 22.4 L CH4 1 mol CH4 = 21.5 L CH4

What is the volume (liters) at STP of 0.960 mol of methane, CH4?

At STP, how many moles are in 0.542 mL of neon gas? 0.542 mL Ne 1 L Ne 1 mol Ne 1000 mL Ne 22.4 L Ne = 2.42 x 10-5 mol Ne

At STP, how many moles are in 0.542 mL of neon gas?