3.1-3.6: General Chemistry I
Calculate the amount of moles in 1.10 grams of iron(III) chloride (FeCl3).
0.00678mol
How many moles are in 2.3 g of phosphorus?
0.074mol
How many lithium atoms are in a 12.0 g sample?
1.04x10^23 atoms
How many total atoms are present in 400. grams of Na2SO4?
1.19x10^25 atoms
How many atoms are in a 24 g sample of carbon?
1.2x10^24 atoms
What is the formula mass of a compound with 2 aluminum atoms and 3 oxygen atoms?
101.964amu
What will be the mass of one mole of carbon atoms?
12g
A compound has a formula of Sb2F3. What is the percent composition of F in this molecule?
18.966%
What is the formula mass of a compound with 2 aluminum atoms, 3 sulfur atoms, and 3 oxygen atoms, in atomic mass units?
198.162amu
Calculate the amount of grams in 88.10 moles of magnesium.
2141g
A 15.8 g sample contains 3.6 g of F, 4.9 g of H, and 7.3 g of C. What is the percent composition of fluorine in this sample?
23%
A 430 g sample of N2I6 would contain how many molecules?
3.3x10^23 molecules
How many total atoms are present in 32.8 grams of Cu2S?
3.72x10^23 atoms
What is the mass in grams of 1.00×106 sodium atoms?
3.82x10^-17g
A 17.10 g compound is made up of 5.900 g N and 11.20 g C. What is the percent composition of nitrogen in this compound?
34.50%
A 27.6 g compound is made up of 16.4 g N and 11.2 g C. What is the percent composition of carbon in this compound?
40.6%
A compound that weighs 56.2 g contains 23.6 g Sb (antimony) and 32.6 g F (fluorine). What is the percent composition of antimony?
42.0%
What is the mass of a sample of barium carbonate (BaCO3) that contains 21.30mol?
4203g
How many barium atoms are in a 9.8×10−21 gram sample?
43 atoms
What is the formula mass in atomic mass units, for CO2?
44.013amu
The mass of 1 mole of CO2 is:
44g
Ammonium nitrite (NH4NO2) has a percent composition of _______ for oxygen.
49.96%
Calculate the total number of atoms in 37.1 grams of LiBr.
5.15x10^23 atoms
Oxygen has a percent composition of _________ in sulfur trioxide (SO3).
59.949%
If you have a balloon filled with one mole of gas at 0∘C and a pressure of 1 atm, how many gas particles do you have?
6.022x10^23
What is equivalent to a mole of carbon atoms?
6.022x10^23 C atoms
Manganese dioxide (MnO2) has a percent composition of _______ for manganese.
63.2%
Copper exists in two naturally occurring isotopes. The average atomic weight of copper is 63.546 amu. If 69.15% exists as 63Cu with an atomic mass of 62.92, then what is the atomic mass of the second isotope?
64.95amu
A compound has a percent composition of 52% C, 13% H, and 35% O. What is the empirical formula?
C2H6O
A compound has a molecular weight of 477.18 g/mol and an empirical formula of C10H7O2. What is the molecular formula?
C30H21O6
A compound consists of 48 g C, 4 g H, and 16 g O. What is the empirical formula?
C4H4O
The molar mass of a compound is 148 g/mol and its empirical formula is C4H10O. What is the molecular formula of this compound?
C8H20O2
A mole is defined as the number of atoms in an exact mass of which isotope?
Carbon-12
A compound has a percent composition of 65.6% Cd, 14.0% C,1.76% H, and 18.7% O. What is the empirical formula?
CdC2H3O2
The atomic masses on the periodic table are listed in:
Atomic mass units
A compound contains 0.73 g Mg and 0.28 g N. What is the empirical formula of this compound?
Mg3N2
What is the empirical formula of a compound with a percent composition of 4.7% N, 7.1% H, 72.2% C, and 16.0% O?
NH21C18O3
When considering precise mass, which particle has the greatest mass?
Neutron
The number of atoms in one mole of oxygen is equal to the number of atoms in ______ of hydrogen.
One mole
Jacob finds that a compound has a molar mass of 128 g/mol and an empirical formula of SO2. What is the molecular formula of this compound?
S2O4
The sum of the average atomic masses of all the atoms present in a substance's formula is known as:
The formula mass (molecular mass)
What unit of measurement pertains to the number of microscopic molecules in a sample?
The mole
If we compare a mole of carbon atoms to a mole of oxygen atoms, which sample will contain more mass?
The oxygen sample
A mole of one element contains _______ number of atoms as a mole of another element.
The same
Compare one mole of hydrogen gas with one mole of oxygen gas. They will have:
The same number of atoms and different masses
If we compare a mole of carbon atoms to a mole of oxygen atoms, which sample will contain more atoms?
They will contain the same number of atoms
What is the common name for Sn?
Tin
