Mole Vocabulary
What is a mole?
Avogadro's number of anything
What is the formula for molarity?
Moles of solute/ Liters of solution
What is a molar mass?
The mass in grams that one mole of a substance is.
What is the volume occupied by one mole of any gas at standard temp and pressure?
22.4 L
Why do some elements contribute more mass to the molecules they are apart of than others?
Because some elements are heavier than others
What is the numerical value of Avogadro's number?
6.022 x 10^23
What is the formula for molality?
Moles of solute/ Kg of solvent
What is the molar mass of water?
18.01 grams per mole
An certain amount of hydrogen gas occupies 48 L at STP. How many moles of hydrogen atoms are present?
2.14 moles
What does % composition describe?
Mass contributions from each element in a molecule
What day is national mole day?
October 23
For a 3 Molar solution of NaCl, we need to dissolve 3 moles of sodium chloride in 1 liter of water. How many grams is that?
175 grams
How many grams are in 5 moles of water?
90 grams
112 L
What percent of the mass of CO2 comes from carbon?
27%
molar mass of co2 = 44 g/ mole
Moles of co2 = moles of carbon
molar mass of carbon = 12 g/ mole
12/ 44 = 27%
The word mole was interchangeable with the word ______ in middle English, which is the suspected origin of the word 'mole' for mice like creatures.
Slug or pest
We add 50 grams of sodium chloride to 120 g of water. What is the molality of our solution?
7.12 molal
How many grams are in 7.5 moles of HCl?
273 grams
How many particles are present in 60 L of gas at standard temperature and pressure?
1.6 x 10^24 particles
How many grams of oxygen can be produced from the decomposition of 100 g of H20?
88.83 g
[ 100 g of H20 = 5.5 moles of h20
5.5 moles of h20 = 5.5 moles of 0
5.5 moles of 0 x 16 g/ 1 mole = 88.83]
The word 'mal' in proto- indo- european translates to ______ which is the believed to be the origin of the use of 'mole' as a description for marks on skin.
dirty, soiled
We need a 2 molar solution of sodium chloride. We only have a beaker that hold 50 ml. How many grams of salt do we add?
5.844 grams
1) find grams in 2 moles at 1 liter 2) Cross multiply
How many moles are in 700 grams of Cuprite (Cu2H2O)?
4.8 moles
A sample of fluorine gas at STP occupies 70 liters. Determine the number of moles of Fluorine and the mass of that Fluorine in grams.
3.125 moles, 59.24 grams
Dichloroethane, a compound that is often used for dry cleaning, contains carbon, hydrogen, and chlorine. It has a molar mass of 99 g/mol. Analysis of a sample shows that it contains 24.3% carbon and 4.1% hydrogen. What is its molecular formula?
C2H4Cl2