Exam 3 Flashcards
(26 cards)
What is a unit equation?
a simple statement of two equivalent quantities
What is a unit conversion factor (unit factor) ?
a ratio of two equivalent options
1 hour = 60 minutes
This is an example of?
A unit equation
1 minute = 1/60th of an hour
This is an example of?
A unit equation
1 hour/60 minutes = 60 minutes/1 hour
This is an example of?
A unit conversion
What is the mole (mol) a measurement of?
The amount of a chemical substance
Atomic Mass Units (amu) are related to what?
Weight in grams
What is the equation for 1 mole aka Avogadro’s Number?
1 mole = 6.02 x 10^23 units
What is the symbol for Avogadro’s Number?
N
1 mole equals what?
Avogadro’s Number - 6.02 x 10^23
Define Molar Mass?
The atomic mass of any substance expressed in grams
What is the symbol for Molas Mass?
MM
If the atomic mass of iron is 55.85 amu, what is its molar mass?
55.85 g/mol
If the atomic mass of Oxygen is 16.00 amu, what is its molar mass?
- 00 g/mol
- - This is because oxygen occurs naturally as a diatomic molecule (O2) so it is 2 times 16.00g
How would you find the mass of a compound, for example, Magnesium Nitrate? Mg(NO3)2
- Find the total mass of each element present
- Add the masses
= Answer in (g/mol)
1 mole = ?
1 atom
1 mol of ANY gas occupies how many liters at standard temperature and pressure?
22.4 L
The volume occupied by ONE MOL of gas is called …
Molar Volume
What is standard temperature?
0 degrees CELSIUS
What is standard pressure
760 mmHg
What is the formula for gas density?
Molar Mass in grams/ Molar Volume in liters
g/L
What is percent composition?
Lists mass percent (weight) of each element
How would you get the percentage of Hydrogen in H20?
- Get mass of hydrogen
- Get molar mass of H20
- Divide mass of hydrogen by molar mass of H20 & multiply by 100
What is empirical formula?
The simplest WHOLE number ratio of
- ions in a forumla unit
- atoms of each element in a molecule
