(a) What is the mass, in grams, of one mole of ¹²C?

(b) How many bromine atoms are present in one mole of ¹²C?

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.

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.

What is the mass, in kilograms, of an Avogadro's number of people, if the average mass of a person is 160 lb?

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?

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.)

Calculate the following quantities: (a) mass, in grams, of 0.105 mol sucrose (C₁₂H₂₂O₁₁)

Calculate the following quantities: (c) number of molecules in 1.0⨉10⁻⁶ mol CH₃CH₂OH

Calculate the following quantities: (d) number of N atoms in 0.410 mol NH₃

Calculate the following quantities: (a) mass, in grams, of 1.50⨉10⁻² mol CdS

Calculate the following quantities: (b) number of moles of NH₄Cl in 86.6 g of this substance

Calculate the following quantities: (c) number of molecules in 8.447⨉10⁻² mol C₆H₆

Calculate the following quantities: (d) number of O atoms in 6.25⨉10⁻³ mol Al(NO₃)₃

(a) What is the mass, in grams, of 2.50⨉10⁻³ mol of ammonium phosphate?

(b) How many moles of chloride ions are in 0.2550 g of aluminum chloride?

(c) What is the mass, in grams, of 7.70⨉10²⁰ molecules of caffeine, C₈H₁₀N₄O₂?

(d) What is the molar mass of cholesterol if 0.00105 mol has a mass of 0.406 g?

(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?

(d) What is the molar mass of diazepam (Valium®) if 0.05570 mol has a mass of 15.86 g?

The molecular formula of allicin, the compound responsible for the characteristic smell of garlic, is C₆H₁₀OS₂. a. What is the molar mass of allicin?

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?

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?

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?

The molecular formula of aspartame, the artificial sweetener marketed as NutraSweet®, is C₁₄H₁₈N₂O₅. (a) What is the molar mass of aspartame?

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?

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?

A sample of glucose, C₆H₁₂O₆, contains 1.250×10²¹ carbon atoms. (c) How many moles of glucose does it contain?

A sample of the male sex hormone testosterone, C₁₉H₂₈O₂, contains 3.88×10²¹ hydrogen atoms. (b) How many molecules of testosterone does it contain?

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?