1. Which statement best describes molar mass?a. the mass of 6.02 x 1023 atoms, which is constant for all substancesb. the mass in grams of 6.02 x 10²3 particles of a given substance, which is unique to each substancec. the mass of a substance that is required to be visible to the naked eyed. the mass of particles in exactly 1.0 L of gas2. An element X has a molar mass of 40.0 g/mol. How many moles are in 10 grams of element X?a. 400 molesb. 4.00 moles4.3. Which statement is true according to the Law of Definite Proportions?a. A chemical compound always contains the same proportions of elements by massb. A chemical compound always contains the same proportions of elements by molar ratioC. A chemical compound always contains the same proportions of elements by volumed. A chemical compound can contain any proportion of elements by massWhat would be the molar mass of germanium tetrafluoride?a. 129.62 g/molb. 148.63 g/mol5. Which of the following is not an empirical formula?a. X3Y7b. X₂Y8Zc. 0.250 molesd. 25.0 moles6. The Law of Multiple Proportions states that:c. 91.63 g/mold. 110.63 g/molc. X2Y2Z2a. Atoms can combine with each other in only one ratio to form a chemical compoundb. Atoms can combine with each other in any ratio to form a chemical compoundc. Atoms can combine with each other in whole number ratios to form chemical compoundsd. Adding more molecules of a substance to the same substance changes the ratio of the atoms in that substance7. Which of the following factors would not increase the calculated percent yield of a reaction?a. using higher purity reactantsb. careful transfer of all reactantsc. a foreign substance being added to the product containerd. some reactant being lost to evaporation8. Drivers ascending high mountain passes sometimes find that their engines suddenly stop running as they increase inaltitude, even with plenty of fuel. What is the limiting reactant in their engine?a. gasolineb. heatc.oxygend. none of the above9. How many atoms are contained in 1.81 x 1024 molecules of carbon dioxide? (n = Avogadro's number)a. nb. 3nd. X₂Y8Zs3d. 9n10. How many moles of lithium are produced from the decomposition of 4.0 moles of lithium oxide?a. 4.0 molesC. 8.0 molesb. 2.0 molesd. More information needed

The molar mass of a compound is described by the moles concept. According to this concept, one molec…

1. Which statement best describes molar mass? a. the mass of 6.02 x 1023 atoms, which is constant for all substances b. the mass in grams of 6.02 x 1023 particles of a given substance, which is unique to each substance c. the mass of a substance that is required to be visible to the naked eye d. the mass of particles in exactly 1.0 L of gas

1. Which statement best describes molar mass? a. the mass of 6.02 x 1023 atoms, which is constant for all substances b. the mass in grams of 6.02 x 1023 particles of a given substance, which is unique to each substance c. the mass of a substance that is required to be visible to the naked eye d. the mass of particles in exactly 1.0 L of gas

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter5: Stoichiometry

Section: Chapter Questions

Problem 135AE

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