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Mole Concept Solutions Library

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838 solutions

Mole Concept

Q. How many atoms are in three moles of carbon?A) 1.8 x 1023 atomsB) 1.8 x 1024 atomsC) 2.023 atomsD) 18.0 atoms

Solved • Apr 2, 2021

Mole Concept

Q. How many atoms of neon are in 5.9 grams of neon?

Solved • Apr 2, 2021

Mole Concept

Q. How many water molecules are in 4.0 moles of water?

Solved • Apr 2, 2021

Mole Concept

Q. How many atoms of oxygen are in one formula unit of Al2(SO4)3?

Solved • Apr 2, 2021

Mole Concept

Q. How many molecules are in 3.6 grams of NaCl?

Solved • Apr 2, 2021

Mole Concept

Q. In a classroom, which comparison would a teacher most likely use for describing a mole?A) cup of water and a liter of oilB) dozen eggs and a dozen ...

Solved • Mar 30, 2021

Mole Concept

Q. The combustion of propane may be described by the chemical equation C3H8(g)+5 O2(g)⟶3CO2(g)+4H2O(g) How many grams of O2(g) are needed to completel...

Solved • Mar 30, 2021

Mole Concept

Q. 0.400 mole of sucrose, C₁₂H₂₂O₁₁, contains ___ moles of C. A) 12 B) 6.02 x 10²³ C) 5.02 x 10²³ D) 2.89 x 10²³ E) 4.80

Solved • Mar 23, 2021

Mole Concept

Q. One mole of copper(II) sulfate, CuSO₄, contains ___ mole of O. A) 4 B) 6.02 x 10²³ C) 1.51 x 10²³ D) 2.41 x 10²³ E) 2.41 x 10²⁴

Solved • Mar 23, 2021

Mole Concept

Q. 0.400 mole of sucrose, C12H22O11, contains ___ C atoms.A) 12B) 6.02 x 1023C) 5.02 x 1023D) 2.89 x 1024E) 4.80

Solved • Mar 23, 2021

Mole Concept

Q. One mole of copper(II) sulfate, CuSO₄, contains___ O atoms.A) 4B) 6.02 x 10²³C) 1.51 x 10²³D) 2.41 x 10²³E) 2.41 x 10²⁴

Solved • Mar 23, 2021

Mole Concept

Q. Avogadro's number is the number of.A) particles in 1 mole of a substanceB) amu in 1 mole of a substanceC) grams in 1 mole of a substanceD) moles in...

Solved • Mar 23, 2021

Mole Concept

Q. One mole of particles of any substance contains how many particles?A) 106 particlesB) 3 x 10⁻10 particlesC) 3 x 1010 particlesD) 6.02 x 10²³ partic...

Solved • Mar 23, 2021

Mole Concept

Q. Which statement best describes a mole?a. It is used mainly for writing chemical formulas.b. It is used for chemical equations that have reversible ...

Solved • Mar 23, 2021

Mole Concept

Q. What does one mole of H2O correspond to? a. 6.02 × 1023 molecules of H2O b. 6.02 × 1023 atoms of H and 6.02 X 1023 atoms of O c. 6.02 × 1023 atoms ...

Solved • Mar 22, 2021

Mole Concept

Q. How many atoms or molecules are there in a mole of a substance?

Solved • Mar 22, 2021

Mole Concept

Q. How many atoms are in 2.50 moles of CO2a. 4.52x1024 atomsb. 1.52x1024 atomsc. 5.02x1024 atomsd. 3.01x1024 atomse. 7.53x1024 atoms

Solved • Mar 22, 2021

Mole Concept

Q. Dinitrogen oxide (or nitrous oxide), N2O, also known as laughing gas, is widely used as an anesthetic in dentistry.Part C. How many grams of N are ...

Solved • Feb 9, 2021

Mole Concept

Q. Dinitrogen oxide (or nitrous oxide), N2O, also known as laughing gas, is widely used as an anesthetic in dentistry.Part B. How many moles of the co...

Solved • Feb 9, 2021

Mole Concept

Q. How many moles of C are in each of the following quantities?Part C. 83 g of CO2Express your answer using two significant figures.

Solved • Feb 9, 2021

Mole Concept

Q. How many moles of C are in each of the following quantities?Express your answer using two significant figures.Part B. 0.30 mole of C2H6

Solved • Feb 9, 2021

Mole Concept

Q. What is the mass of 2.98x1024 atoms of helium?a. 19.8 gb. 7.18 gc. 11.6 gd. 4.95 ge. 29.2 g

Solved • Feb 5, 2021

Mole Concept

Q. Dinitrogen oxide (or nitrous oxide), N2O, also known as laughing gas, is widely used as an anesthetic in dentistry.Part A. How many grams of the co...

Solved • Feb 5, 2021

Mole Concept

Q. How many moles of C are in each of the following quantities?Part A. 71 g of CExpress your answer using two significant figures.

Solved • Feb 5, 2021

Mole Concept

Q. Calculate the number of moles in 3.47 g of each of the following:Part A. HePart B. SnO2Part C. Cr(OH)3Part D. Ca3N2

Solved • Feb 5, 2021

Mole Concept

Q. If one mole of Na3PO4•3H2O is heated extensively, how many moles of water would be released?

Solved • Feb 5, 2021

Mole Concept

Q. What is the mass (in g) of 7 atoms of helium?

Solved • Feb 3, 2021

Mole Concept

Q. What is the mass of 0.7891 mol of ferric oxide, Fe2O3?

Solved • Feb 1, 2021

Mole Concept

Q. How many phosphorus atoms contained in 1.58 kg of phosphorus?a. 3.07x1027 phosphorous atomsb. 3.25x1028 phosphorous atomsc. 2.95x1027 phosphorous a...

Solved • Jan 27, 2021

Mole Concept

Q. How many moles of N2O4 are in 37.3 g N2O4? A) 7.02 x 103 molB) 1.42 x 10-4 molC) 0.405 molD) 0.829 mol

Solved • Jan 27, 2021

Mole Concept

Q. How many Fe atoms are contained in 787 g of Fe? A) 5.90 x 1025 Fe atomsB) 7.09 x 1021 Fe atomsC) 8.59 x 1024 Fe atomsD) 4.27 x 1022 Fe atoms

Solved • Jan 27, 2021

Mole Concept

Q.  Na2SiO3(s) + 8 HF(aq) → H2SiF6(aq) + 2 NaF(aq) + 3 H2O(l)a. How many moles of HF are needed to react with 0.305 mol of Na2SiO3?b. How many grams o...

Solved • Jan 26, 2021

Mole Concept

Q. a. What is the mass of one helium atom?b. What is the mass of 1.5 moles of helium atoms?

Solved • Nov 18, 2020

Mole Concept

Q. a. If you had 0.15 kg of helium, how many helium atoms would you have? b. If you had 12 dozen helium atoms, what would be their mass? 

Solved • Nov 18, 2020

Mole Concept

Q. How many aluminum atoms are there in 13.4 g of aluminum oxide, Al2O3?

Solved • Nov 16, 2020

Mole Concept

Q. How many water molecules are in a block of ice containing 2.5 mol of water?

Solved • Nov 13, 2020

Mole Concept

Q. How many atoms are in 1.50 moles of fluorine gas?

Solved • Nov 3, 2020

Mole Concept

Q. How many SO32- ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g/mol.

Solved • Nov 2, 2020

Mole Concept

Q. How many moles of atoms are in 4.00 g of 13C?

Solved • Nov 2, 2020

Mole Concept

Q. What is the mass of a single aluminum atom?

Solved • Nov 2, 2020

Mole Concept

Q. How many moles of N2O4 are in 76.3 g N204? The molar mass of N2O4 is 92.02 g/mol a) 7.02x103 moles b)1.42x10-4 moles c) 1.00 mole d) 1.21 moles e) ...

Solved • Oct 26, 2020

Mole Concept

Q. Calculate the number of oxygen atoms in 29.34g of sodium sulfate, Na2SO4.

Solved • Oct 23, 2020

Mole Concept

Q. How many grams of glucose (C6H12O6) are in 3.55 moles of glucose?

Solved • Oct 23, 2020

Mole Concept

Q. What is the mass in grams of 5.40 moles of lithium?A) 6.94B) 3.25x1024C) 1.29D) 37.5

Solved • Oct 19, 2020

Mole Concept

Q. Using your answer from Part A, calculate the volume of a mole of Na atoms (in cm3 /mol). Assume that the entire volume is occupied by Na atoms leav...

Solved • Jul 2, 2020

Mole Concept

Q. How many molecules are contained in a 7.50-g sample of dimethylmercury?Express your answer in molecules to three significant figures.Alkyl derivati...

Solved • Jul 1, 2020

Mole Concept

Q. The fuel used in many disposable lighters is liquid butane, C4H10. How many carbon atoms are in 3.00 g of butane?You can extend the analysis to sam...

Solved • Jul 1, 2020

Mole Concept

Q. Calculate the mass of 1.00 × 1024 (a septillion) molecules of water.You can extend the analysis to samples of a given mass using the molar mass of ...

Solved • Jul 1, 2020

Mole Concept

Q. A flask contains 0.500 mol of liquid bromine, Br2. Determine the number of bromine molecules present in the flask.Express your answer numerically i...

Solved • Jul 1, 2020

Mole Concept

Q. How many oxygen atoms are in 3.50 g of quartz?Matter is made up atoms, but in a real chemistry lab, we measure substances in grams. Therefore you n...

Solved • Jul 1, 2020

Mole Concept

Q. Part B. How many silicon-30 atoms are found in this plate? Express your answer numerically using two significant figures.Monel metal is a corrosion...

Solved • Jul 1, 2020

Mole Concept

Q. Based on your answer in Part B, how many neutrons are in this amount of 13C? Express your answer numerically in neutrons.The mole (abbreviated mol)...

Solved • Jul 1, 2020

Mole Concept

Q. Based on your answer in Part B, how many electrons are in this amount of 13C? Express your answer numerically in electrons.The mole (abbreviated mo...

Solved • Jul 1, 2020

Mole Concept

Q. Based on your answer in Part A, calculate the number of atoms in this amount of 13C? Express your answer numerically in atoms of carbon.The mole (a...

Solved • Jul 1, 2020

Mole Concept

Q. How many moles of atoms are in 4.00 g of 13C? Express your answer numerically in moles.The mole (abbreviated mol) is a counting unit used to simpli...

Solved • Jul 1, 2020

Mole Concept

Q. (b) How many sulfur atoms are in 1.10 mol of aluminum sulfide? Express the number of atoms of S.

Solved • Jun 30, 2020

Mole Concept

Q. (a) How many sulfur atoms are in 0.45 mol BaSO4?  Express the number of atoms of S.

Solved • Jun 30, 2020

Mole Concept

Q. The world population is estimated to be approximately 7 billion people. How many moles of people are there?

Solved • Jun 30, 2020

Mole Concept

Q. Very small crystals composed of 1000 to 100,000 atoms, called quantum dots, are being investigated for use in electronic devices.. (c) The density ...

Solved • Jun 30, 2020

Mole Concept

Q. Very small crystals composed of 1000 to 100,000 atoms, called quantum dots, are being investigated for use in electronic devices. (b) How many sili...

Solved • Jun 30, 2020

Mole Concept

Q. How is Avogadro's number referred to as a mole?

Solved • Jun 16, 2020

Mole Concept

Q. Exactly 1 mol of H3PO4 contains how many moles of H, P, and O?

Solved • Jun 16, 2020

Mole Concept

Q. Calculate the mass of 9.33 x 1014 SO3 molecules in scientific notation

Solved • Jun 16, 2020

Mole Concept

Q. A sample of glucose C6H12O6 contain 2.0 X 1022 atoms of carbona) How many atoms of hydrogen does the sample contain?b) How many molecules of glucos...

Solved • Jun 16, 2020

Mole Concept

Q. How many argon (Ar) atoms are there in 1.5 x 102 g of argon?

Solved • Jun 16, 2020

Mole Concept

Q. You need 2.5 mol of iron (Fe) for an experiment. How many grams of iron must you measure out?

Solved • Jun 16, 2020

Mole Concept

Q. How many mol of carbon are in 34.4 g of aluminum acetate?

Solved • Jun 16, 2020

Mole Concept

Q. How many moles of carbon atoms are there in 0.500 moles of C2H6?

Solved • Jun 15, 2020

Mole Concept

Q. Calculate the number of oxygen atoms in 29.34 g of sodium sulfate,Na2SO4.A. 1.244 × 1023 O atomsB. 4.976 × 1023 O atomsC. 2.409 × 1024 O atomsD. 2....

Solved • Apr 30, 2020

Mole Concept

Q. How many moles of chlorine atoms would be in 0.165 moles of PCI3?(a) 8.92 (b) 26.77 (c) 1.4 x 10-3 (d) 0.495 

Solved • Apr 30, 2020

Mole Concept

Q. If you had 0.165 moles of PCI3 how many grams of PCI3 would you have? (a) 2112 (b) 8.92 (c) 4.7 x 10-4 (d) 22.66 (e) none of these

Solved • Apr 30, 2020

Mole Concept

Q. If you weighed out 125 grams of PCI3 how many moles of PCI3 would you have? (a) 0.91 (b) 5.492 (c) 3.4 x 103 (d) none of these

Solved • Apr 30, 2020

Mole Concept

Q. A mole is... (a) the number of atoms in exactly 12.00 grams of C-12 (b) Avogadro's number of particles (c) 6.022 x 1023 particles (d) all of these ...

Solved • Apr 30, 2020

Mole Concept

Q. How many molecules are in 237 g (about a cup) of water? (a) 1513.1 (b) 4267 (c) 6.02 x1023 (d) 93 x 1024 (e) 7.93 x 1024

Solved • Apr 30, 2020

Mole Concept

Q. What mass of carbon is present in 1.4 x 1020 molecules of sucrose (C12H22O11)?Molar mass of C12H22O11 = 342 g/mol

Solved • Apr 30, 2020

Mole Concept

Q. The number of hydrogen atoms in 0.050 mol of C3H8O3 is A) 3.0 x 1022 H atomB) 1.2 × 1023 H atomsC) 2.4 × 1023 H atomsD) 4.8 x 1023 H atomsE) none o...

Solved • Apr 29, 2020

Mole Concept

Q. Which sample contains the greatest number of moles of Cl?(a) 3.8 mol HCl(b) 1.7 mol CH2Cl2(c) 4.2 mol NaClO3(d) 2.2 mol Mg(ClO4)2

Solved • Apr 28, 2020

Mole Concept

Q. How many moles of oxygen are in 25.45 g of CaCO3?

Solved • Apr 28, 2020

Mole Concept

Q. Calculate the total number of:A) atoms in one molecule of trinitrotoluene (TNT), CH3C6H2(NO2)3B) atoms in 1.08 × 10+3 mol CH3(CH2)4CH2OHC) F atoms ...

Solved • Apr 27, 2020

Mole Concept

Q. What mass (in mg) does 2.63 moles of nickel have?

Solved • Apr 23, 2020

Mole Concept

Q. The world population is estimated to be approximately 7 billion people. How many moles of people are there?Express your answer using one significan...

Solved • Apr 22, 2020

Mole Concept

Q. How many atoms of oxygen are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol. A. 1.23 × 1023 O atoms B. 2.96 × 1024 O...

Solved • Apr 20, 2020

Mole Concept

Q. How many moles of PCl3 contain 3.68 x 1025 chlorine atoms? A. 61.1 moles PCl3 B. 20.4 moles PCl3 C. 16.4 moles PCl3 D. 54.5 moles PCl3E. 49.1 moles...

Solved • Apr 20, 2020

Mole Concept

Q. What is the formula for ammonium sulfide? How many hydrogen atoms are in 7.20 mol of ammonium sulfide?

Solved • Apr 15, 2020

Mole Concept

Q. (a) If the average mass of a single hydrogen atom is 1.67 x 10-24 g, what is the mass in grams of 6.02 x 1023 hydrogen atoms? How does your answer ...

Solved • Apr 14, 2020

Mole Concept

Q. How many nitrogen atoms are in 10.2 g of copper(II) nitrate?

Solved • Apr 14, 2020

Mole Concept

Q. Part A:How many moles of atoms are in 4.00 g of 13C? Express your answer numerically in moles. Part B:Based on your answer above, can you help to c...

Solved • Apr 14, 2020

Mole Concept

Q. Determine the number of atoms for each element present in the following molecule: BaSO4SHOW YOUR WORK PLEASE

Solved • Mar 17, 2020

Mole Concept

Q. A raindrop has a mass of 50. mg and the Pacific Ocean has a mass of 7.08 X 1020 kg. Use this information to answer the questions below. Be sure you...

Solved • Mar 17, 2020

Mole Concept

Q. Determine the mass of oxygen in a 7.2-g sample of Al2(SO4)3. Express the mass in grams to two significant figures.

Solved • Mar 17, 2020

Mole Concept

Q. What is the mass in grams of 9.76 x 1012 atoms of sodium?A. 22.99 gB. 1.63 x 1011 gC. 3.73 x 10-10D. 1.07 x 1014 gE. 7.05 x 1023 g

Solved • Nov 28, 2019

Mole Concept

Q. How many Br - anions are there in 3.50 g of MgBr 2?a. 3.17 x 1025 anionsb. 1.14 x 1022 anionsc. 6.34 x 1025 anionsd. 2.29 x 1022 anions

Solved • Sep 30, 2019

Mole Concept

Q. How many molecules of N2O4 are in 76.3 g N2O4? The molar mass of N2O4 is 92.02 g/mol.a. 5.54 x 1025 N2O4 moleculesb. 4.99 x 1023 N2O4 moleculesc. 4...

Solved • Sep 30, 2019

Mole Concept

Q. How many individual ions are in 18.2 grams of Al2S3?A. 7.30 × 1023 ions      B. 1.85 × 10 23 ions      C. 9.28 × 10 23 ions      D. 3.65 × 10 23 io...

Solved • Sep 18, 2019

Mole Concept

Q. How many chlorine atoms are in 1.0g of CCl4?a) 6.0 × 1023            b) 6.5 × 10-3       c) 3.9 × 1021        d) 1.6 × 1022          e) 3.9 × 1022

Solved • Sep 14, 2019

Mole Concept

Q. How many atoms are contained in 51.6 mL mercury (Hg)? The density of Hg is 13.5 g/mL.a. 1.11 x 10-2b. 3.47c. 6.68 x 1021d. 2.09 x 1024e. 8.41 x 1028

Solved • Sep 14, 2019

Mole Concept

Q. How many moles of copper are in 35.8 grams of copper (Cu)?a. 5.94 x 10-23b. 3.39 x 1023c. 0.563d. 1.78e. 2280

Solved • Sep 14, 2019

Mole Concept

Q. Assume a perfect sphere of Al has a radius of 0.700 mm. How many Al atoms are in the sphere?The density of Al is 2.70 g/cm3. Volume of a sphere = 4...

Solved • Sep 14, 2019

Mole Concept

Q. How many Zn atoms are contained in 922 g of Zn?A) 4.18 × 1024 Zn atomsB) 4.27 × 1022 Zn atomsC) 5.90 × 1025 Zn atomsD) 8.49 × 1024 Zn atomsE) 7.09 ...

Solved • Sep 12, 2019

Mole Concept

Q. What mass (in kg) does 4.77 moles of nickel have? A) 0.280 kgB) 0.632 kg C) 0.352 kg D) 0.820 kg E) 0.122 kg

Solved • Sep 12, 2019