Chemistry Chemistry Practice Problems Solutions Library

Mole Concept Solutions Library

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928 solutions

Mole Concept

Q. What is the molar mass of Fe(NH 4)2(SO4)2•6H2O(s) (hint: you have to include the 6 water molecules in this hydrated compound)?

Solved • Aug 6, 2019

Mole Concept

Q. How many molecules are there in 230 grams of CoCl2?

Solved • Aug 6, 2019

Mole Concept

Q. How many grams are there in 9.4 x 10 25 molecules of H2?

Solved • Aug 6, 2019

Mole Concept

Q. How many molecules are there in 122 grams of Cu(NO 3)2?

Solved • Aug 6, 2019

Mole Concept

Q. How many grams are there in 7.5 x 10 23 molecules of H2SO4?

Solved • Aug 6, 2019

Mole Concept

Q. How many grams are there in 7.4 x 10 23 molecules of AgNO3?

Solved • Aug 6, 2019

Mole Concept

Q. How many grams are there in 2.3 x 10 24 atoms of silver?

Solved • Aug 6, 2019

Mole Concept

Q. How many molecules are there in 450 grams of Na 2SO4?

Solved • Aug 6, 2019

Mole Concept

Q. How many molecules are there in 24 grams of FeF 3?

Solved • Aug 6, 2019

Mole Concept

Q. Determine the number of atoms for each element present in the following molecule: BaSO4Using the periodic table of elements, determine the molar ma...

Solved • Jul 11, 2019

Mole Concept

Q. What mass of nitrogen is present in 5.00 moles of the compound below?c. (NH4)2Cr2O7

Solved • Dec 5, 2018

Mole Concept

Q. The reaction between nickel metal and hydrochloric acid is not a simple dissolution. The product is NiCl2 6H2O(s), nickel(II) chloride hexahydrate,...

Solved • Dec 3, 2018

Mole Concept

Q. Xenon is the heaviest stable noble gas with a molar mass of 131 g/mol.Table 10.1 Some Common Compounds That Are Gases at Room TemperatureFormulaNam...

Solved • Oct 31, 2018

Mole Concept

Q. Glycine, an amino acid used by organisms to make proteins, is represented by the molecular model below.Determine its molar mass.

Solved • Oct 31, 2018

Mole Concept

Q. Glycine, an amino acid used by organisms to make proteins, is represented by the molecular model below.Calculate how many moles of glycine are in a...

Solved • Oct 31, 2018

Mole Concept

Q. Very small semiconductor crystals composed of approximately 1000 to 100,000 atoms, are called quantum dots. Quantum dots made of the semiconductor ...

Solved • Oct 31, 2018

Mole Concept

Q. Very small semiconductor crystals composed of approximately 1000 to 100,000 atoms, are called quantum dots. Quantum dots made of the semiconductor ...

Solved • Oct 31, 2018

Mole Concept

Q. What is the mass, in grams, of 5 mol of 12C?

Solved • Oct 31, 2018

Mole Concept

Q. How many carbon atoms are present in a mole of 12C?

Solved • Oct 31, 2018

Mole Concept

Q. You may want to reference (Pages 93 - 98) Section 3.4 while completing this problem.Indicate whether each statement is true or false.(a) A mole of ...

Solved • Oct 31, 2018

Mole Concept

Q. Determine which of the following samples contains the fewest sodium atoms.(a) 1 mol sodium oxide (b) 45 g sodium fluoride(c) 50 g sodium chloride (...

Solved • Oct 31, 2018

Mole Concept

Q. A 508-g sample of sodium bicarbonate (NaHCO3) contains how many moles of sodium bicarbonate (NaHCO3)?

Solved • Oct 31, 2018

Mole Concept

Q. Determine the formula weights of each of the following compounds.Nitrous oxide, N2O, known as laughing gas and used as an anesthetic in dentistry.

Solved • Oct 31, 2018

Mole Concept

Q. Determine the formula weights of each of the following compounds.Benzoic acid, HC7H5O2, a substance used as a food preservative.

Solved • Oct 31, 2018

Mole Concept

Q. Determine the formula weights of each of the following compounds.Mg(OH)2, the active ingredient in milk of magnesia.

Solved • Oct 31, 2018

Mole Concept

Q. Determine the formula weights of each of the following compounds.Urea, (NH2)2CO, a compound used as a nitrogen fertilizer.

Solved • Oct 31, 2018

Mole Concept

Q. Determine the formula weights of each of the following compounds.Isopentyl acetate, CH3CO2C5H11, responsible for the odor of bananas.

Solved • Oct 31, 2018

Mole Concept

Q. A sample of an ionic compound containing iron and chlorine is analyzed and found to have a molar mass of 126.8 g/mol. What is the charge of the iro...

Solved • Oct 31, 2018

Mole Concept

Q. What is the mass, in grams, of 6.33 mol of NaHCO3?

Solved • Oct 31, 2018

Mole Concept

Q. What is the mass, in grams, of 3.0x10-5 mol of sulfuric acid?

Solved • Oct 31, 2018

Mole Concept

Q. How many chlorine atoms are there in 12.2 g of CCl4?

Solved • Oct 31, 2018

Mole Concept

Q. The molecular formula of acetylsalicylic acid (aspirin), one of the most common pain relievers, is C9H8O4.How many moles of C9H8O4 are in a 0.600 g...

Solved • Oct 31, 2018

Mole Concept

Q. The molecular formula of acetylsalicylic acid (aspirin), one of the most common pain relievers, is C9H8O4.How many moles of C9H8O4 are in a 0.500-g...

Solved • Oct 31, 2018

Mole Concept

Q. The molecular formula of acetylsalicylic acid (aspirin), one of the most common pain relievers, is C9H8O4.How many moles of C9H8O4 are in a 0.500-g...

Solved • Oct 31, 2018

Mole Concept

Q. Consider a sample of calcium carbonate in the form of a cube measuring 2.505 in. on each edge.If the sample has a density of 2.72 g/cm3 , how many ...

Solved • Oct 31, 2018

Mole Concept

Q. You are given a cube of silver metal that measures 1.050 cm on each edge. The density of silver is 10.5 g/cm3.How many atoms are in this cube?

Solved • Oct 31, 2018

Mole Concept

Q. You may want to reference(Pages 50 - 52)Section 3.4 while completing this problem.One molecule of the antibiotic known as penicillin G has a mass o...

Solved • Oct 31, 2018

Mole Concept

Q. A piece of aluminum foil 1.00 cm square and 0.560 mm thick is allowed to react with bromine to form aluminum bromide.How many moles of aluminum wer...

Solved • Oct 31, 2018

Mole Concept

Q. Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are inc...

Solved • Oct 31, 2018

Mole Concept

Q. Calculate the following quantities.Mass (in grams) of 2.00×10−2 mol of CdS.

Solved • Oct 31, 2018

Mole Concept

Q. Calculate the following quantities.Number of moles (n) of NH4Cl in 96.6 g of this substance.

Solved • Oct 31, 2018

Mole Concept

Q. Calculate the following quantities.Number of molecules in 8.457×10−2 mol C6H6.

Solved • Oct 31, 2018

Mole Concept

Q. Calculate the following quantities.Number of O atoms in 7.25×10−3 mol Al(NO3)3.

Solved • Oct 31, 2018

Mole Concept

Q. What is the mass, in grams, of 1.30 mol of iron (III) sulfate?

Solved • Oct 31, 2018

Mole Concept

Q. How many moles of ammonium ions are in 6.965 g of ammonium carbonate?

Solved • Oct 31, 2018

Mole Concept

Q. What is the mass, in grams, of 1.50×1021 molecules of aspirin, C9H8O4?

Solved • Oct 31, 2018

Mole Concept

Q. What is the molar mass of diazepam (Valium®) if 0.05570 mol weighs 15.86 g?

Solved • Oct 31, 2018

Mole Concept

Q. A sample of the male sex hormone testosterone, C19H28O2, contains 3.68×1021 atoms of hydrogen.How many atoms of carbon does it contain?

Solved • Oct 31, 2018

Mole Concept

Q. A sample of the male sex hormone testosterone, C19H28O2, contains 3.68×1021 atoms of hydrogen.How many molecules of testosterone does it contain?

Solved • Oct 31, 2018

Mole Concept

Q. A sample of the male sex hormone testosterone, C19H28O2, contains 3.68×1021 atoms of hydrogen.How many moles of testosterone does it contain?

Solved • Oct 31, 2018

Mole Concept

Q. A sample of the male sex hormone testosterone, C19H28O2, contains 3.68×1021 atoms of hydrogen.What is the mass of this sample in grams?

Solved • Oct 31, 2018

Mole Concept

Q. Comparing the mass of 1 molecule and 1 mol of H2O. Both masses have the same number but different units (atomic mass units and grams). Expressing b...

Solved • Oct 31, 2018

Mole Concept

Q. Procedure for interconverting mass and number of formula units. The number of moles of the substance is central to the calculation. Thus, the mole ...

Solved • Oct 31, 2018

Mole Concept

Q. Procedure for interconverting mass and number of formula units. The number of moles of the substance is central to the calculation. Thus, the mole ...

Solved • Oct 31, 2018

Mole Concept

Q. Which has more mass, a mole of water (H2O) or a mole of glucose (C6H12O6)?

Solved • Oct 31, 2018

Mole Concept

Q. Which contains more molecules, a mole of water or a mole of glucose?

Solved • Oct 31, 2018

Mole Concept

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

Solved • Oct 31, 2018

Mole Concept

Q. The molecular formula of allicin, the compound responsible for the characteristic smell of garlic, is C6H10OS2.How many moles of allicin are presen...

Solved • Oct 31, 2018

Mole Concept

Q. The molecular formula of allicin, the compound responsible for the characteristic smell of garlic, is C6H10OS2.How many molecules of allicin are in...

Solved • Oct 31, 2018

Mole Concept

Q. The molecular formula of allicin, the compound responsible for the characteristic smell of garlic, is C6H10OS2.How many S atoms are present in 5.50...

Solved • Oct 31, 2018

Mole Concept

Q. The molecular formula of aspartame, the artificial sweetener marketed as NutraSweet, is C 14 H18 N2 O5.What is the molar mass of aspartame?

Solved • Oct 31, 2018

Mole Concept

Q. The molecular formula of aspartame, the artificial sweetener marketed as NutraSweet, is C14H18N2O5.How many moles of aspartame are present in 3.50 ...

Solved • Oct 31, 2018

Mole Concept

Q. The molecular formula of aspartame, the artificial sweetener marketed as NutraSweet, is C 14 H18 N2 O5. How many molecules of aspartame are present...

Solved • Oct 31, 2018

Mole Concept

Q. The molecular formula of aspartame, the artificial sweetener marketed as NutraSweet, is C 14 H18 N2 O5.How many hydrogen atoms are present in 3.50 ...

Solved • Oct 31, 2018

Mole Concept

Q. A sample of glucose, C6H12O6, contains 1.260×1021 carbon atoms.How many atoms of hydrogen does it contain?

Solved • Oct 31, 2018

Mole Concept

Q. A sample of glucose, C6 H12 O6, contains 1.260×1021 carbon atoms.How many molecules of glucose does it contain?

Solved • Oct 31, 2018

Mole Concept

Q. A sample of glucose, C6 H12 O6, contains 1.260×1021 carbon atoms.How many moles of glucose does it contain?

Solved • Oct 31, 2018

Mole Concept

Q. A sample of glucose, C6H12O6, contains 1.260×1021 carbon atoms.What is the mass of this sample in grams?

Solved • Oct 31, 2018

Mole Concept

Q. The allowable concentration level of vinyl chloride, C2H3Cl, in the atmosphere in a chemical plant is 2.2 × 10−6 g/L .How many moles of vinyl chlor...

Solved • Oct 31, 2018

Mole Concept

Q. The allowable concentration level of vinyl chloride, C2H3Cl, in the atmosphere in a chemical plant is 2.2×10−6 g/L .How many molecules per liter?

Solved • Oct 31, 2018

Mole Concept

Q. At least 26 g of tetrahydrocannabinol (THC), the active ingredient in marijuana, is required to produce intoxication. The molecular formula of THC ...

Solved • Oct 31, 2018

Mole Concept

Q. At least 25 µg of tetrahydrocannabinol (THC), the active ingredient in marijuana, is required to produce intoxication. The molecular formula of THC...

Solved • Oct 31, 2018

Mole Concept

Q. Without doing any detailed calculations (but using a periodic table to give atomic weights), rank the following samples in order of decreasing numb...

Solved • Oct 31, 2018

Mole Concept

Q. What is the mass, in kilograms, of an Avogadros number of people, if the average mass of a person is 170 lb?

Solved • Oct 31, 2018

Mole Concept

Q. 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 o...

Solved • Oct 31, 2018

Mole Concept

Q. Calculate the following quantities.Mass, in grams, of 0.155 mol sucrose (C12H22O11).

Solved • Oct 31, 2018

Mole Concept

Q. Calculate the following quantities.Moles of Zn(NO3)2 in 151.50 g of this substance.

Solved • Oct 31, 2018

Mole Concept

Q. Calculate the following quantities.Number of molecules in 6×10−6 mol CH3CH2OH.

Solved • Oct 31, 2018

Mole Concept

Q. Calculate the following quantities.Number of N atoms in 0.550 mol NH3.

Solved • Oct 31, 2018

Mole Concept

Q. What is the mass, in grams, of 2.60×10−3 mol of ammonium phosphate?

Solved • Oct 31, 2018

Mole Concept

Q. How many moles of chloride ions are in 0.2560 g of aluminum chloride?

Solved • Oct 31, 2018

Mole Concept

Q. What is the mass, in grams, of 7.60×1020 molecules of caffeine, C8H10N4O2?

Solved • Oct 31, 2018

Mole Concept

Q. What is the molar mass of cholesterol if 0.00105 mol weighs 0.406 g?

Solved • Oct 31, 2018

Mole Concept

Q. Determine the formula weights of each of the following compounds.nitric acid, HNO3

Solved • Oct 31, 2018

Mole Concept

Q. Determine the formula weights of each of the following compounds.KMnO4

Solved • Oct 31, 2018

Mole Concept

Q. Determine the formula weights of each of the following compounds.Ca3(PO4)2

Solved • Oct 31, 2018

Mole Concept

Q. Determine the formula weights of each of the following compounds.quartz, SiO2

Solved • Oct 31, 2018

Mole Concept

Q. How many fluorine atoms are present in 5.86 g of C2F4?

Solved • Oct 31, 2018

Mole Concept

Q. How many bromines atoms are present in 35.3 g of CH2Br2?

Solved • Oct 31, 2018

Mole Concept

Q. How many bromine atoms are present in 34.8 g of CH2Br2?

Solved • Oct 31, 2018

Mole Concept

Q. What is the mass of a drop of water containing 3.55x1022 H2O molecules?

Solved • Oct 31, 2018

Mole Concept

Q. Butane (C4H10) is a liquid fuel used in lighters. How many grams of carbon are in a lighter containing 7.05 mL of butane? (The density of liquid bu...

Solved • Oct 31, 2018

Mole Concept

Q. Find the number of ibuprofen molecules in a tablet containing 205.0 mg of ibuprofen (C13H18O2).

Solved • Oct 31, 2018

Mole Concept

Q. Determine the mass of oxygen in a 6.8-g sample of Al2(SO4)3.

Solved • Oct 31, 2018

Mole Concept

Q. Calculate the mass (in grams) of each sample.5.1×1025 O3 molecules

Solved • Oct 31, 2018

Mole Concept

Q. Calculate the mass (in grams) of each sample.5.01×1019 CCl2F2 molecules

Solved • Oct 31, 2018

Mole Concept

Q. Calculate the mass (in grams) of each sample.6 water molecule(s)

Solved • Oct 31, 2018

Mole Concept

Q. Determine the number of moles of oxygen atoms in each of the following.4.77 mol H2 O2

Solved • Oct 31, 2018

Mole Concept

Q. Determine the number of moles of oxygen atoms in each of the following.2.16 mol N2 O

Solved • Oct 31, 2018

Mole Concept

Q. Determine the number of moles of oxygen atoms in each of the following.2.23×10−2 mol H2 CO3

Solved • Oct 31, 2018