Mole <-->Count
What do you get when you cut an avocado into 6.02 x 1023 pieces?
Guac-a-mole
What is the sequence of steps from grams to atoms of a molecule?
grams -> moles -> molecules -> atoms
What is the molar mass of H3PO4?
98.00g/mol
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 a part of than others?
Because some elements are heavier than others
How many moles are 1.20 x 1025 atoms of Phosphorus?
19.9 moles
How many grams are in 1.5 x 1025 molecules of CO2 ?
1096 g rounded to 1100 g
How many moles in 140.0 g of NaOH?
3.500 moles
An certain amount of hydrogen gas occupies 48.0 L at STP. How many moles of hydrogen are present?
2.14 moles
What is the empirical formula of the compound containing 75% C and 25% H?
CH3
How many atoms are in 0.750 moles of Zn?
4.52 x 1023 atoms
A 5.0 g sample of O2 is in a container at STP. What volume is the container?
3.5 L
How many grams are in 5 moles of water?
90 g
What volume will 5.00 moles of vaporized HCl occupy at standard temperature and pressure?
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%
How many molecules are there in 31.8 moles of water?
1.91 x 1025 molecules
How many grams of H2 are in balloon holding 44.8L of the gas?
Liters ->moles -> grams
4.00 grams
How many grams are in 7.50 moles of HCl?
273 g
How many moles are present in 16.8 L of gas at standard temperature and pressure?
0.750 moles
The empirical formula of a compound is CH2. If its molecular mass is 70 g/mol, what is its molecular formula?
C5H10
4.5 x 1016 molecules of carbon dioxide are equal to how many moles?
7.5 x 10-8 moles
How many atoms of Hydrogen are there in 35g of glucose?
grams -> moles -> molecules -> atoms
= 1.4 x 1024 atoms of H
How many moles are in 45.7 grams of Calcium carbonate(CaCO3)?
0.457 moles
A sample of fluorine gas at STP occupies 70.0 liters. Determine the number of moles of Fluorine and the mass of that Fluorine in grams.
3.13 moles, 59.4 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