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

2. CHAPTER 7 THE MOLE Part 2

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

4. Find the mass in grams of 3.32 mol of K.
3.32 mol K g K mol K
= x 102 g K

5. Find the mass in grams of 3.32 mol of K.

6. Find the mass in grams of 15.0 mol of sulfuric acid.
H2SO4
H x 1.0 = 2.0 S 1 x 32.1 = 32.1 O 4 x 16.0 = g
15.0 mol H2SO g H2SO mol H2SO4
= 1470 g H2SO4

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

8. 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 CH g CH4
= mol CH4
What was Avogadro’s favorite Indian tribe?
The MOLEHICANS

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

10. Molti-Step Mole Problems!
Calculate the number of molecules present in 4.29 g of nitrogen dioxide (NO2).
4.29 g NO2 1 mol NO x1023 m.c. NO2=
46.0 g NO mol NO2
= 5.61x1022 molecules NO2

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

12. 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
= mol S atoms

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

14. 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 CO g CO2
6.02x1023 m.c. CO2 1 mol CO2
= 1.82 x 10-2 grams CO2

15. Molti-Step Mole Problems!

16. Molti-Step Mole Problems!
Calculate the grams of carbon in 12.2 mol sucrose, C12H22O11.
12.2 mol C12H22O mol C atoms g C
1 mol C12H22O mol C atoms
= 1.76 x 103 g carbon

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

18. 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!

19. -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 x 1023 particles of the gas 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!

20. 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)

21. What is the volume (liters) at STP of 0.960 mol of methane, CH4?
0.960 mol CH L CH mol CH4
= 21.5 L CH4

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

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

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