Minerals in soils and soil amendments (e.g., fertilizers) are described by formula units that describe their composition, and are used similarly to the formulas describing molecules. Thus, the formula weight of calcium carbonate (CaCO3) is the mass of one mole of CaCO3, is used just like a molecular weight, and is found by adding up the atomic weights of the elements in the formula unit CaCO3. What is the mass in grams of 0.518 moles of calcium carbonate (CaCO3)?

Minerals in soils and soil amendments (e.g., fertilizers) are described by formula units that describe their composition, and are used similarly to the formulas describing molecules. Thus, the formula weight of calcium carbonate (CaCO3) is the mass of one mole of CaCO3, is used just like a molecular weight, and is found by adding up the atomic weights of the elements in the formula unit CaCO3. What is the mass in grams of 0.518 moles of calcium carbonate (CaCO3)?

World of Chemistry

7th Edition

ISBN:9780618562763

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter9: Chemical Quantities

Section: Chapter Questions

Problem 47A

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Suppose that the atomic mass of C-12 is taken to be 5.000 amu and that a mole is defined as the number of atoms in 5.000 kg of carbon-12. How many atoms would there be in one mole under these conditions? (Hint: There are 6.0221023 C atoms in 12.00 g of C-12.)
A power plant is driven by the combustion of a complex fossil fuel having the formula C11H7S. Assume the air supply is composed of only N2 and O2 with a molar ratio of 3.76:1.00, and the N2 remains unreacted. In addition to the water produced, the fuels C is completely combusted to CO2 and its sulfur content is converted to SO2. In order to evaluate gases emitted at the exhaust stacks for environmental regulation purposes, the nitrogen supplied with the air must also be included in the balanced reactions. a Including the N2 supplied m the air, write a balanced combustion equation for the complex fuel assuming 100% stoichiometric combustion (i.e., when there is no excess oxygen in the products and the only C-containing product is CO2). Except in the case of N2, use only integer coefficients. b Including N2 supplied in the air, write a balanced combustion equation for the complex fuel assuming 120% stoichiometric combustion (i.e., when excess oxygen is present in the products and the only C-containing product is CO2). Except in the case of use only integer coefficients c Calculate the minimum mass (in kg) of air required to completely combust 1700 kg of C11H7S. d Calculate the air/fuel mass ratio, assuming 100% stoichiometric combustion. e Calculate the air/fuel mass ratio, assuming 120% stoichiometric combustion.
In 1997, at the United Nations Conference on Climate Change, the major industrial nations agreed to expand their re-search efforts to develop renewable sources of carbon-basedfuels. For more than a decade, Brazil has been engaged in aprogram to replace gasoline with ethanol derived from the rootcrop manioc (cassava).(a) Write separate balanced equations for the complete combus-tion of ethanol (C₂H₅OH) and of gasoline (represented by theformula C₈H₁₈).(b) What mass of oxygen is required to burn completely 1.00 Lof a mixture that is 90.0% gasoline (d=0.742 g/mL) and 10.0%ethanol (d=0.789 g/mL) by volume?(c) If 1.00 mol of O₂ occupies 22.4 L, what volume of O₂ isneeded to burn 1.00 L of the mixture?(d) Air is 20.9% O₂ by volume. What volume of air is needed toburn 1.00 L of the mixture?
320.4 grams of isomaltitol, C12H24O11, was combusted in a furnace completely in an excess oxygen. The products of this reaction are liquid water and gaseous carbon dioxide. How much water (in kg) do you expect from this reaction assuming that all of the isomaltitol reacts? Enter your numeric answer in the units of kg. Do not enter the unit. Use enough significant digits to prevent rounding errors. Hint: balance the reaction first. Recall that 1 kg = 1000 g.
How many grams of P2O5P2O5 are formed when 9.51 g 9.51 g of phosphorus reacts with excess oxygen? Show the unit analysis used for the calculation by placing the correct components into the unit-factor slots.
Combustion of hydrocarbons such as butane ( C4H10 ) produces carbon dioxide, a "greenhouse gas." Greenhouse gases in the Earth's atmosphere can trap the Sun's heat, raising the average temperature of the Earth. For this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide. Write a balanced chemical equation, including physical state symbols, for the combustion of gaseous butane into gaseous carbon dioxide and gaseous water. Suppose 0.480kg of butane are burned in air at a pressure of exactly 1atm and a temperature of 10.0°C . Calculate the volume of carbon dioxide gas that is produced. Be sure your answer has the correct number of significant digits.
A molecular compound has the formula C12H12O2. How many grams of this compound would you need to measure out in order to obtain 0.0800 mol of the compound? Be sure to calculate your answer to the correct number of significant figures and with the correct units.
Iron(II) sulfate forms several hydrates with the general formula FeSO4·xH2O, where x is an integer. If the hydrate is heated, the water can be driven off, leaving pure FeSO4 behind. Suppose a sample of a certain hydrate is heated until all the water is removed, and it's found that the mass of the sample decreases by45.%. Which hydrate is it? That is, what is x?
A binary compound of carbon and hydrogen has the following percentage composition: 82. 66% carbon, 17. 34% hydrogen by mass. If the molar mass of the compound is determined by experiment to be between 58 and 59G/MOL, what are the empirical and molecular formulas of the compound?
The molar mass of caffeine is 194.19 g. Is the molecularformula of caffeine C4H5N2O or C8H10N4O2?
The human body excretes nitrogen in the form of urea,NH₂CONH₂. The key biochemical step in urea formation is thereaction of water with arginine to produce urea and ornithine.(a) What is the mass percent of nitrogen in urea, arginine, andornithine? (b) How many grams of nitrogen can be excreted asurea when 135.2 g of ornithine is produced?
23 In a universe far, far away, there exists an alien world where they have a different periodic table, as shown below. Elements behave just like they do here, there are just less of them, and they have different names. You can calculate molar mass and other things from this periodic table just like you would from the periodic table on our world. In this alien world, the following reaction occured: Oj(s) + 3Ro(s) --> OjRo3(s) Please calculate the how many grams of Jucium Romide (OjRo3) will be produced when 5.58 grams of Romium reacts. Atomic Number Symbol Name Atomic mass (g/mol) 1 J Jellium 1.28 2 Ja Jamium 2.48 3 Jo Jobium 4.87 4 Oj Jucium 7.27 5 R Racium 9.39 6 Ro Romium 11.10 7 Ju Julietium 14.05 8 Rm Randomium 15.28 9 Jr Juniorium 18.11 10 Jp Jeepium 19.05 11 Xr Xraium 21.88 12 Jx Jaxium 23.75 13 Rr Railroadium 25.21

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