Chemistry Chemistry Practice Problems Solutions Library

Mole Concept Solutions Library

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758 solutions

Mole Concept

Q. Using the periodic table of elements, determine the molar mass for this molecule: BaSO4SHOW YOUR WORK PLEASE

Solved • Mar 17, 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. Sodium reacts with oxygen to form sodium oxide and has the following balanced chemical equation: 4 Na + O2 → 2 Na2O. How many mole(s) of oxygen gas...

Solved • Mar 12, 2020

Mole Concept

Q. Consider the heating curve shown below for 22.86 grams of an unknown substance. You may assume constant pressure conditions. Note: the points are l...

Solved • Dec 19, 2019

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. For which compound does 0.256 mole weigh 12.8 g?A. C2H4OB. CO2C. CH3ClD. C2H6E. none of these

Solved • Nov 21, 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. Calculate the molar mass of Ba(C 2O4)2.a. 313.37 g/molb. 328.01 g/molc. 301.90 g/mold. 128.53 g/mole. 294.77 g/mol

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. What is the molar mass of MgCl 2?A. 127.21 g mol–1      B. 75.76 g mol–1      C. 59.76 g mol–1D. 84.07 g mol–1      E. 95.21 g mol–1

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. Identify the element from the following information. In 10.234 grams of this element, there are 1.050 x 1023 atoms.a. Hb. Scc. Nid. Hfe. Au

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

Mole Concept

Q. How many chlorine atoms are there in 4.50 mol of aluminum chloride?

Solved • Sep 1, 2019

Mole Concept

Q. How many oxygen atoms are there in 7.00 g of sodium dichromate, Na 2Cr2O7?

Solved • Sep 1, 2019

Mole Concept

Q. How many Fe(II) ions are there in 20.00 g of FeSO 4?

Solved • Sep 1, 2019

Mole Concept

Q. How many moles of C8H18 contain 9.25 x 1024 molecules of C8H18?

Solved • Sep 1, 2019

Mole Concept

Q. What is the mass of 0.500 mol of dichlorodifluoromethane (CCl 2F2)?

Solved • Sep 1, 2019

Mole Concept

Q. How many iron atoms are contained in 354 g of iron?

Solved • Sep 1, 2019

Mole Concept

Q. How many moles of Kr are contained in 398 mg of Kr?

Solved • Sep 1, 2019

Mole Concept

Q. A 15.5 gram sample of diphosphorus pentoxide contains how many grams of phosphorus?

Solved • Sep 1, 2019

Mole Concept

Q. How many molecules of nitrogen monoxide are in a 22.5 gram sample?

Solved • Sep 1, 2019

Mole Concept

Q. What is the mass of 1.56 x 10 26 atoms of magnesium in grams?

Solved • Sep 1, 2019

Mole Concept

Q. What is the mass of 0.560 moles of chlorine gas?

Solved • Sep 1, 2019

Mole Concept

Q. How many moles of Cu are in 1.48 x 10 25 Cu atoms?

Solved • Sep 1, 2019

Mole Concept

Q. How many atoms are in 5.80 moles of He?

Solved • Sep 1, 2019

Mole Concept

Q. If 2.01 x 1023 atoms of an element from Group IA on the periodic table has a mass of 7.675 grams, this element is most likely...

Solved • Sep 1, 2019

Mole Concept

Q. How many moles are there in 17.5 grams of sodium?

Solved • Sep 1, 2019

Mole Concept

Q. The density of acetic anhydride (C4H6O3) is 1.08 g/mL. How many moles are contained in 5mL? Please show in detail how the answer was obtained.

Solved • Aug 29, 2019

Mole Concept

Q. What is the molar mass of dinitrogen monoxide?

Solved • Aug 25, 2019

Mole Concept

Q. What is the molar mass of silver nitrate?

Solved • Aug 25, 2019

Mole Concept

Q. What is the molar mass of sodium carbonate?

Solved • Aug 25, 2019

Mole Concept

Q. What is the mass of one atom of copper in grams?

Solved • Aug 8, 2019

Mole Concept

Q. What is the molecular mass of sodium oxide  Na2O?

Solved • Aug 8, 2019

Mole Concept

Q. How many hydroxide ions are in 2.5 mol Mg(OH) 2?

Solved • Aug 8, 2019

Mole Concept

Q. What is the molecular weight of oxygen?

Solved • Aug 8, 2019

Mole Concept

Q. A sample of chlorine gas has a mass of 39.2 grams. How many  Cl2 molecules are there in the sample?

Solved • Aug 8, 2019

Mole Concept

Q. What is the number of moles of beryllium atoms in 36 g of  Be?

Solved • Aug 7, 2019

Mole Concept

Q. What is the molar mass of lithium oxide, Li2O?

Solved • Aug 7, 2019

Mole Concept

Q. What is the mass (in grams) of 9.92 x 10 24 molecules of methanol (CH3OH)?

Solved • Aug 6, 2019

Mole Concept

Q. How many atoms are in 0.920g of P2O5?

Solved • Aug 6, 2019

Mole Concept

Q. Calculate the number of atoms in a 2.93 x 10 23 g sample of silicon.

Solved • Aug 6, 2019

Mole Concept

Q. Calculate the formula mass of calcium iodite Ca(IO 2)2 in amu.

Solved • Aug 6, 2019

Mole Concept

Q. The chemical formula for t-butanol is: (CH3)3COH. Calculate the molar mass of t-butanol. Round your answer to 2 decimal places.

Solved • Aug 6, 2019

Mole Concept

Q. Calculate the formula weight of cobalt (III) carbonate, Co 2(CO3)3 in amu per formula unit, and grams per mole. Please show details.

Solved • Aug 6, 2019

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

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.Isopentyl acetate, CH3CO2C5H11, responsible for the odor of bananas.

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. 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. 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. 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. 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. 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.How many molecules of allicin are in...

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. 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. 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 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 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. What is the mass, in grams, of 7.60×1020 molecules of caffeine, C8 H10 N4 O2?

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 bromine atoms are present in 34.8 g of CH2Br2?

Solved • Oct 31, 2018