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문제 30a
(a) What is the mass, in grams, of one mole of 12C?
문제 30b
(b) How many bromine atoms are present in one mole of 12C?
문제 31
Without doing any detailed calculations (but using a periodic table to give atomic weights), rank the following samples in order of increasing numbers of atoms: 0.50 mol H2O, 23 g Na, 6.0⨉1023 N2 molecules.
문제 32
Without doing any detailed calculations (but using a periodic table to give atomic weights), rank the following samples in order of increasing numbers of atoms: 42 g of NaHCO3,1.5molCO2,6.0×1024 Ne atoms.
문제 33a
What is the mass, in kilograms, of an Avogadro's number of people, if the average mass of a person is 160 lb?
문제 33b
What is the mass, in kilograms, of an Avogadro's number of people, if the average mass of a person is 160 lb? How does this compare with the mass of Earth, 5.98⨉1024 kg?
문제 34a
If an Avogadro’s number of pennies is divided equally among the 321 million men, women, and children in the United States, how many dollars would each receive? How does this compare with the gross domestic product (GDP) of the United States, which was $21.4 trillion in 2019? (GDP is the total market value of the nation’s goods and services.)
문제 35a
Calculate the following quantities: (a) mass, in grams, of 0.105 mol sucrose (C12H22O11)
문제 35c
Calculate the following quantities: (c) number of molecules in 1.0⨉10−6 mol CH3CH2OH
문제 35d
Calculate the following quantities: (d) number of N atoms in 0.410 mol NH3
문제 36a
Calculate the following quantities: (a) mass, in grams, of 1.50⨉10−2 mol CdS
문제 36b
Calculate the following quantities: (b) number of moles of NH4Cl in 86.6 g of this substance
문제 36c
Calculate the following quantities: (c) number of molecules in 8.447⨉10−2 mol C6H6
문제 36d
Calculate the following quantities: (d) number of O atoms in 6.25⨉10−3 mol Al(NO3)3
문제 37a
(a) What is the mass, in grams, of 2.50⨉10−3 mol of ammonium phosphate?
문제 37b
(b) How many moles of chloride ions are in 0.2550 g of aluminum chloride?
문제 37c
(c) What is the mass, in grams, of 7.70⨉1020 molecules of caffeine, C8H10N4O2?
문제 37d
(d) What is the molar mass of cholesterol if 0.00105 mol has a mass of 0.406 g?
문제 38a
(a) What is the mass, in grams, of 1.223 mol of iron(III) sulfate? (b) How many moles of ammonium ions are in 6.955 g of ammonium carbonate? (c) What is the mass, in grams, of 1.50 * 1021 molecules of aspirin, C9H8O4?
문제 38d
(d) What is the molar mass of diazepam (Valium®) if 0.05570 mol has a mass of 15.86 g?
문제 39a
The molecular formula of allicin, the compound responsible for the characteristic smell of garlic, is C6H10OS2. a. What is the molar mass of allicin?
문제 39b
The molecular formula of allicin, the compound responsible for the characteristic smell of garlic, is C6H10OS2. (b) How many moles of allicin are present in 5.00 mg of this substance?
문제 39c
The molecular formula of allicin, the compound responsible for the characteristic smell of garlic, is C6H10OS2. (c) How many molecules of allicin are in 5.00 mg of this substance?
문제 39d
The molecular formula of allicin, the compound responsible for the characteristic smell of garlic, is C6H10OS2. (d) How many S atoms are present in 5.00 mg of allicin?
문제 40a
The molecular formula of aspartame, the artificial sweetener marketed as NutraSweet®, is C14H18N2O5. (a) What is the molar mass of aspartame?
문제 40c
The molecular formula of aspartame, the artificial sweetener marketed as NutraSweet®, is C14H18N2O5. (c) How many molecules of aspartame are present in 1.00 mg of aspartame?
문제 40d
The molecular formula of aspartame, the artificial sweetener marketed as NutraSweet®, is C14H18N2O5. (d) How many hydrogen atoms are present in 1.00 mg of aspartame?
문제 41c
A sample of glucose, C6H12O6, contains 1.250×1021 carbon atoms. (c) How many moles of glucose does it contain?
문제 42b
A sample of the male sex hormone testosterone, C19H28O2, contains 3.88×1021 hydrogen atoms. (b) How many molecules of testosterone does it contain?
문제 43a
The allowable concentration level of vinyl chloride, C2H3Cl, in the atmosphere in a chemical plant is 2.0×10−6 g/L. How many moles of vinyl chloride in each liter does this represent?