the number of grams of an element that is numerically equal to the atomic mass of the element in amu
question
representative particle
answer
an atom, an ion, or a molecule, depending upon the way a substance commonly exists
question
mole
answer
the SI unit used to measure amount of substance
question
Avogadro's number
answer
the number of representative particles of a substance present in 1 mole of that substance
question
percent composition
answer
the percent by mass of each element in a compound
question
standard temperature and pressure
answer
0° and 1 atm
question
empirical formula
answer
the smallest whole number ratio of the atoms in a compound
question
Which of the following exists as a diatomic molecule?
answer
nitrogen
question
Avogadro's number of representative particles is equal to one
answer
mole
question
All of the following are equal to Avogadro's number EXCEPT
answer
the number of atoms of bromine in 1 mole Br₂
question
How many nitrogen atoms are in 5 molecules of isopropyl alcohol, C₃H₇O?
answer
35
question
Which of the following is NOT true about atomic mass?
answer
The atomic mass is 12 g for magnesium.
question
What is true about the molar mass of chlorine gas?
answer
The molar mass is 71.0 g.
question
The mass of a mole of NaCl is the
answer
molar mass
question
The molar mass of C₇H₁₆ and the molar mass of CaCO₃ contain approximately the same number of
answer
grams
question
For which of the following conversions does the value of the conversion factor depend upon the formula of the substance?
answer
mass of any substance to moles
question
The volume of one mole of a substance is 22.4 L at STP for all
answer
gases
question
The molar volume of a gas at STP occupies
answer
22.4 L
question
Which combination of temperature and pressure correctly describes standard temperature and pressure, STP?
answer
0°C and 101 kPa
question
The molar mass of a substance can be calculated from its density alone, if that substance is a
answer
gas at STP
question
The molar mass of a gas can be determined from which of the following?
answer
the density of the gas at STP
question
A 22.4-L sample of which of the following substances at STP would contain 6.02 x 10²³ representative particles?
answer
oxygen
question
Given 1.00 mole of each of the following gases at STP, which gas would have the greatest volume?
answer
All would have the same volume.
question
If the density of a noble gas is 1.783 g/L at STP, that gas is
answer
Ar
question
To determine the formula of a new substance, one of the first steps is to find the
answer
percent composition
question
What information is needed to calculate the percent composition of a compound?
answer
the formula of the compound and the atomic mass of its elements
question
Which of the following compounds has the lowest percent gold content by weight?
answer
AuI₃
question
Which of the following compounds has the highest oxygen content by weight?
answer
H₂O
question
The lowest whole-number ratio of the elements in a compound is called the
answer
empirical formula
question
Which of the following is NOT an empirical formula?
answer
C₂N₂H₈
question
Which of the following compounds have the same empirical formula?
answer
C₇H₁₄ and C₁₀H₂₀
question
What is the empirical formula of a compound that is 40% sulfur and 60% oxygen by weight?
answer
SO₃
question
What is the empirical formula of a substance that is 53.5% C, 15.5% H, and 31.1% N by weight?
answer
C₂H₈N
question
The ratio of carbon atoms to hydrogen atoms to oxygen atoms in a molecule of dicyclohexyl maleate is 4 to 6 to 1. What is its molecular formula if its molar mass is 280 g?
answer
C₁₆H₂₄O₄
question
Which of the following is NOT true about empirical and molecular formulas?
answer
The empirical formula of a compound can be triple its molecular formula.
question
Which of the following sets of empirical formula, molar mass, and molecular formula is correct?
answer
CH₄N, 90 g, C₃H₁₂N₃
question
Diatomic molecules
answer
H₂, F₂, Cl₂, I₂, N₂, O₂, Br₂
Haven't found what you need?
Search for quizzes and test answers now
Quizzes.studymoose.com uses cookies. By continuing you agree to our cookie policy
