HOW BIG IS A MOLE? AVOGADRO'S NUMBER
Using the periodic table, complete the following. Element: hydrogen symbol: H 2 Molecular weight: g Mass of one mole: g/mol
(screwed up on this one)
Compound formula: MgCl 2 Element: Mg # of Atoms: 1 Element: Cl # of Atoms: 2 gram formula weight (g): 95.21 Compound Formula: KNO 3 Element: K # of Atoms: 1, 3, 2, Element: N # of Atoms: 1, 2, 3, Element: O # of Atoms: 1, 2, 3, gram formula weight (g): 101.11, 69.1, 207.33
1, 1, 3, 101.11
Compound formula: MgCl 2 Element: Mg # of Atoms: 1 Element: Cl # of Atoms: 2 gram formula weight (g): 95.21 Compound Formula: HCl Element: H # of Atoms: Element: Cl # of Atoms: gram formula weight (g):
1, 1, 36.46
Compound formula: MgCl 2 Element: Mg # of Atoms: 1 Element: Cl # of Atoms: 2 gram formula weight (g): 95.21 Compound Formula: Na 2 CO 3 Element: Na # of Atoms: Element: C # of Atoms: 3, 1, 2 Element: O # of Atoms: 2, 3, 1 gram formula weight (g): 105.99, 130.01, 55.00
2, 1, 3, 105.99
How much mass would a mole of hydrogen molecules contain? Recall that hydrogen is diatomic. 2.016, 1.008, 4.032 g/mol
2.016
Using the periodic table, complete the following. Element: uranium symbol: U Atomic weight: g Mass of one mole: g/mol
238 (both)
Uranium has an atomic weight of 238 amu. Weight of one mole of uranium = g/mol Weight of one mole of oxygen = 16.00 g The molar mass or molecular weight for U 2 0 5 is g/mol.
238 g/mol, 556 g/mol
Weight of one mole of carbon = 12.01 g Weight of one mole of oxygen = 16.00 g The molecular weight (gram formula weight) for CO is
28.01
How much mass would a mole of nitrogen molecules contain? Recall that nitrogen is diatomic. 28.02, 42.015, 56.04 g/mol
28.02
How much mass would a mole of oxygen molecules contain? Recall that oxygen is diatomic. 32.00, 16.00, 8.00 g/mol
32.00
Using the periodic table, complete the following. Element: oxygen symbol: O 2 Molecular weight: g Mass of one mole: g/mol
32.00 (both)
Using the periodic table, complete the following. Element: calcium symbol: Ca Atomic weight: g Mass of one mole: g/mol
40.08 (both)
When 3.00 moles of hydrogen molecules and 1.50 moles of oxygen molecules react, they form 3.00 moles of water according to the reaction below. How many grams of water were formed? (Hint: This answer will have 3 SF.) 0.0185 g 54.0 g 6.01 g 0.167 g
54.0 g
Using the periodic table, complete the following. Element: iron symbol: Fe Atomic weight: g Mass of one mole: g/mol
55.85 (both)
When 3.00 moles of hydrogen molecules and 1.50 moles of oxygen molecules react, they form 3.00 moles of water according to the reaction below. How many grams of hydrogen were required to form 3.00 moles of water? 0.672 g 1.49 g 6.05 g 0.0469 g
6.05
Using the periodic table, complete the following. Element: chlorine symbol: Cl 2 Molecular weight: g Mass of one mole: g/mol
70.90 (both)
The number of particles in one mole of a substance is:
Avogadro's number
Avogadro's number is equal to 6.02 x 10 25 particles/mole.
False
T/F The mass of 0.100 mole of neon is 2.018 grams.
False
T/F The mass of 0.25 mole of sodium is 92 grams.
False
T/F The mass of 0.500 mole of Ba is 274.6 grams.
False
Example: Compound formula: MgCl 2 Element: Mg # of Atoms: 1 Element: Cl # of Atoms: 2 gram formula weight (g): 95.21 What do the small numbers of 12, 22, and 11 stand for in C 12 H 22 O 11 ? - number of atoms - relative weight - number of molecules - atomic weight
Number of atoms
T/F An equation is the symbolic representation of a chemical reaction based on the Conservation of Mass.
True
T/F The mass of 0.50 mole of copper is 32 grams.
True
T/F The mass of 1 mole of lithium is 6.941 grams.
True
When 3.00 moles of hydrogen molecules and 1.50 moles of oxygen molecules react, they form 3.00 moles of water according to the reaction below. Does the mass of oxygen required equal the mass of the water formed? no yes
no
