Molar Mass
How do you calculate the molar mass of a compound?
Add up the atomic masses of all of the atoms in the formula.
How many molecules of H2O are in 3.5 moles?
2.1x1024 molecules
How many "things" are in one mole?
If you want to calculate the number of grams of a sample of 1.62x1022 molecules, what is your first step?
Convert to moles by dividing by Avogadro's number.
What is the electron configuration for selenium (Se)?
[Ar] 4s23d104p4 OR 1s22s22p63s23p64s23d104p4
What is the unit for molar mass?
grams per mole
1.53 g
How many people are in 2.00 moles?
1.20 x 1024 people
How many atoms are in a sample of 57.14 g of silver?
3.190x1023 atoms
Rank the following elements by increasing (smallest to largest) atomic radius: carbon, aluminum oxygen, potassium.
oxygen, carbon, aluminum, potassium
What is the molar mass of H2O (with units)?
18.015 g/mole
How many moles is 7.431x1020 molecules of carbon tetrachloride?
1.234x10-3 moles
It is estimated that there are 7.5x1018 grains of sand on earth. How many moles is this?
1.2x10-5 moles
How many atoms of hydrogen are in 4.99 moles of C6H12O6?
3.61x1025 atoms
Why does HF have a higher boiling point than HCl?
HF has hydrogen bonding, HCl only has dipole-dipole interactions.
What is the molar mass of sulfur trioxide?
80.066 g/mole
How many moles is 45.9 g of carbon tetrachloride?
0.298 moles
What is the molar mass of dice if an average one weighs 4.10 g?
2.47 x 1024 g/mole
What is the mass of 5.78x1018 molecules of dinitrogen tetroxide?
8.83x10-4 g
(12.2 + 106.4281) x 15.331
3 (1.82x103)
What is the molar mass of calcium phosphate?
What is the mass of 0.117 moles of potassium hydroxide?
6.56 g
If I had 3.11 moles of quarters stacked on top of each other and each quarter was 24.26 mm wide, how high would the stack be in kilometers?
4.54 x 1022 km
8.57x1022 molecules
One type of barcode scanner has a wavelength of 950 nanometers. What is the energy associated with this light?
2.1x10-19 J