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Ch. 7: The Mole
Measuring and Counting Atoms and Molecules
Terms in this set (47)
What is the SI unit that measures the amount of a substance?
How many particles are in a mole of any substance?
6.02 x 10^23 particles
What is Avogadro's number?
6.02 x 10^23
Which elements exist as diatomic molecules?
hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, iodine
What words are used to describe particles in chemistry?
ions, molecules, or atoms
What is the representative unit of neon?
What is the representative unit of water?
What is the representative unit of sodium?
What is the representative unit of sodium chloride?
an ionic compound (or formula unit)
What is the representative unit of trioxygen pentasulfide?
What is the representative unit of oxygen gas?
a molecule (remember: oxygen is a diatomic molecule, so it is O2 is a molecule of oxygen)
How many molecules are in 1 mole of O2?
6.02 x 10^23 molecules of O2 are in 1 mole; notice that O2 is a molecules so the unit we use is molecules
How many molecules are in 2 moles of O2?
1.2 x 10^24 molecules of O2 are in 2 moles?
How many atoms are in 3 moles of iron?
1.8 x 10^24 atoms of iron in 3 moles of iron; notice that iron is an atom so the units we use are atoms
How many particles of NaBr are in 3 moles of NaBr?
1.8 x 10^24 particles of NaBr or formula units of NaBr; notice that the answer is the same as Q #14
How many atoms are in C2H4?
there are 6 atoms in C2H4; notice that this is referring to a single molecule of C2H4; add 2 atoms of C to 4 atoms of H and the total is 6
How many chloride ions are in calcium chloride (CaCl2)?
2 chloride ions
How many atoms are in aluminum sulfate, Al2(SO4)3?
2 Al + 3 S + 12 O
How many atoms are in 4.50 moles of copper, Cu?
2.71 x 10^24 atoms of Cu
What units expresses the mass of an element or compound?
What is molar mass?
the mass in grams of one mole of a substance
What is the molar mass of carbon?
What is the molar mass of molecular oxygen?
32.0 g/mol; remember oxygen is diatomic!
How many places after the decimal place should you round to when recording atomic mass and molar mass?
1 place after the decimal place
What information does a molecular formula provide?
A molecular formula shows how many atoms of each element a substance contains.
How many atoms of hydrogen are in C3H7OH?
8 atoms of H
What is the molar mass of carbon dioxide, CO2?
44.0 g; add the mass of 1 carbon atom to 2 oxgyen atoms
What is the mass of 2 moles of carbon dioxide?
What is the molar mass of molecular nitrogen?
28.0 g; remember nitrogen is diatomic (N2)
What is the mass of barium nitrate, Ba(NO3)2?
What is the mass of 1.72 mol calcium chloride, CaCl2?
How many moles are in 100 g of sodium chloride?
What is the molar volume of a gas?
the volume occupied by one mole of a gas
What is STP?
Standard temperature and pressure
0 celsius/ 273 K
1 atm/ 101.3 kpa
What volume does any gas occupy at STP?
How many particles are in 22.4 L of any gas?
6.02 x 10^23 particles
What is the volume of 2 moles of chlorine gas at STP?
Why is the molar volume determined at STP?
because the volume of a gas varies with changes in temperature or pressure
What is the volume of 0.60 mol of SO2 gas at STP?
13 L of SO2
What is density?
What is the density of a gas at STP?
molar mass/molar volume
What are the common units for density of a gas?
What happens to the volume of a gas when it is heated (the temperature is increased)?
the volume increases
What happens to the density of a gas that is heated?
the density decreases
What happens to the density of a gas that is cooled?
the density increases
What happens to the volume of a gas that is cooled?
the volume decreases
If you have 3 moles of iron and 3 moles of copper, which has the most atoms?
neither has more atoms; 3 moles of any substance contains the same number of atoms as 3 moles of any other substance
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