The mass of a single atom of an element (in amu) is equal to the mass in grams of 1 mole of the element The empirical formula weight is always a whole number multiple of the molecular formula weight The quantity of product that is calculated to form when all of the limiting reagents reacts is called the theoretical yield In a balanced equation, the numerical coefficients arrived at in balancing the equation are identical with the number of moles of each substance More than one of the above

The mass of a single atom of an element (in amu) is equal to the mass in grams of 1 mole of the element The empirical formula weight is always a whole number multiple of the molecular formula weight The quantity of product that is calculated to form when all of the limiting reagents reacts is called the theoretical yield In a balanced equation, the numerical coefficients arrived at in balancing the equation are identical with the number of moles of each substance More than one of the above

World of Chemistry, 3rd edition

3rd Edition

ISBN:9781133109655

Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Chapter9: Chemical Quantities

Section: Chapter Questions

Problem 67A

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hich of the following statements is true for the reaction of nitrogen gas with hydrogen gas to produce ammonia (NH3)? Choose the best answer. l type='a'> Subscripts can be changed to balance this equation, just as they can he changed to balance the charges when writing the formula for an ionic compound. i>The nitrogen and hydrogen will not react until you have added the correct mole ratios. i>The mole ratio of nitrogen to hydrogen in the balanced equation is 1:2. i>Ammonia will not form unless 1 mole of nitrogen and 3 moles of hydrogen have been added. i>The balanced equation allows you to predict how much ammonia you will make based on the amount of nitrogen and hydrogen present.
A chemist prepared a compound that she thought had the formula FeI3. When the compound was analyzed, it contained 18.0% Fe and 82.0% I. Calculate the mass percentage composition expected for FeI3 and compare the result with that found in the analysis. Is this the correct formula of the compound?
Write the balanced equation, then outline the steps necessary to determine the information requested in each of the following: (a) The number of moles and the mass of Mg required to react with 5.00 g of HCl and produce MgCl2 and H2. (b) The number of moles and the mass of oxygen formed by the decomposition of 1.252 g of silver(I) oxide. (c) The number of moles and the mass of magnesium carbonate, MgCO3, required to produce 283 g of carbon dioxide. (MgO is the other product.) (d) The number of moles and the mass of water formed by the combustion of 20.0 kg of acetylene, C2H2, in an excess of oxygen. (e) The number of moles and the mass of barium peroxide, BaO2, needed to produce 2.500 kg of barium oxide, BaO ( O2 is the other product.) (f) The number of moles and the mass of required to react with H2O to produce 9.55 g of
Ammonia can be formed from a combination reaction of its elements. A small fraction of an unreacted mixture of elements is illustrated in the following diagram, in which white spheres represent hydrogen atoms and blue spheres represent nitrogen atoms. The temperature is such that all species are gases. a Write and balance the equation for the reaction. b Which of the following correctly represents the product mixture? c Which species is the limiting reactant? Explain.
It sodium peroxide is added to water, elemental oxygen gas is generated: :math>Na2O2(s)+H2O(l)NaOH(aq)+O2(g) ppose 3.25 g of sodium peroxide is added to a large excess of water. What mass of oxygen gas will be produced?
A mordant is a substance that combines with a dye to produce a stable fixed color in a dyed fabric. Calcium acetate is used as a mordant. It is prepared by the reaction of acetic acid with calcium hydroxide. 2CH3CO2H+Ca(OH)2Ca( CH3 CO2)2+2H2O What mass of Ca(OH)2 is required to react with the acetic acid in 25.0 mL of a solution having a density of 1.065 g/mL and containing 58.0% acetic acid by mass?
When balancing a chemical equation, which of the following statements is false? l type='a'> Subscripts in the reactants must be conserved in the products. i>Coefficients are used to balance the atoms on both sides. i>The law of conservation of matter must he followed. i>Phases are often shown for each compound hut are not critical to balancing an equation.
Write the balanced equation, then outline the steps necessary to determine the information requested in each of the following: (a) The number of moles and the mass of Mg required to react with 5.00 g of HCl and produce MgCl2 and H2. (b) The number of moles and the mass of oxygen formed by the decomposition of 1.252 g of silver(I) oxide. (c) The number of moles and the mass of magnesium carbonate, MgCO3, required to produce 283 g of carbon dioxide. (MgO is the other product.) (d) The number of moles and the mass of water formed by the combustion of 20.0 kg of acetylene, C2H2, in an excess of oxygen. (e) The number of moles and the mass of barium peroxide, BaO2, needed to produce 2.500 kg of barium oxide, BaO ( O2 is the other product.) (f) The number of moles and the mass of required to react with H2O to produce 9.55 g of 43. Determine the number of moles and the mass requested for each reaction in Exercise 4.42.