2. Atoms & Elements

Calculating Molar Mass

객관식
How many grams are in 0.16 moles of sodium carbonate (Na2CO3)?
698
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객관식
What is the oxygen-to-hydrogen mass ratio in hydrogen peroxide (H2O2)?
108
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객관식
What is the molar mass of ammonia (NH_3)?
179
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객관식
Given a 0.300 M solution of HF, what concentration of NaF is required to achieve [H3O+] = 2.3 × 10^{-4} M? (Assume Ka for HF = 7.2 × 10^{-4} and that NaF fully dissociates.)
113
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객관식
Which of the following is the molar mass of carbon (C)?
164
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객관식
What is the mass of sodium (Na) in grams present in 7.5 grams of sodium benzoate (NaC7H5O2)?
744
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객관식
Which quantity is equivalent to 39 grams of LiF?
136
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객관식
What is the molar mass of sucrose (C12H22O11) in grams per mole?
757
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미해결 질문
What is the molar mass of 1-butene if 5.38 × 10¹⁶ molecules of 1-butene weigh 5.00 μg?
1204
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객관식
The atomic mass of argon is 39.948 amu. Without any mathematical computations, which of the following isotopes has the largest natural abundance?

Exact Mass 3 Isotopes of Argon
Isotope Isotopic Mass
³⁶Ar 35.96755 amu
³⁸Ar 37.96272 amu
⁴⁰Ar 39.96238 amu
3796
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객관식
Which of the following is the correct molar mass (to two decimal places) of silver nitrate, AgNO_3?
112
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객관식
What is the mass of one mole of carbon atoms?
120
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객관식
What is the mass of 7.00 mol of hydrogen peroxide (H_2O_2)?
119
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객관식
Benzene has the chemical formula C_6H_6. If you have 24.0 grams of benzene, how many grams of hydrogen are present in this sample?
127
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객관식
What is the mass of 4.32 mol of GaI_3?
114
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Exact Mass 3 Isotopes of Argon
Isotope	Isotopic Mass
³⁶Ar	35.96755 amu
³⁸Ar	37.96272 amu
⁴⁰Ar	39.96238 amu