Concept explainers
(a)
Interpretation:
The number of moles of the given substance is to be calculated.
(a)
Explanation of Solution
The given compound is
Hence, the number of moles in
(b)
Interpretation:
The number of moles of the given substance is to be calculated.
(b)
Explanation of Solution
The given compound is
Hence, the number of moles of
(c)
Interpretation:
The number of moles of the substance given is to be calculated.
(c)
Explanation of Solution
The given compound is
Hence, the number of moles of
(d)
Interpretation:
The number of moles of the substance given is to be calculated.
(d)
Explanation of Solution
The given compound is
Hence, the number of moles of
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Chapter 4 Solutions
INTRO TO CHEMISTRY EBK ACCESS CARD >I<
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- Calculate the mass in grams of 3.839 moles of (a) hydrazine, a rocket propellant. (b) caffeine, C4H5N2O. (c) theobromine, C7H8N4O2, the alkaloid present in chocolate and cocoa.arrow_forwardWhat amount (moles) is represented by each of these samples? a. 20.0 mg caffeine, C8H10N4O2 b. 2.72 1021 molecules of ethanol, C2H5OH c. 1.50 g of dry ice, CO2arrow_forwardHow many moles of specified particles are present in a sample of each of the following substances if each sample weighs 5.00 g? a. CO molecules b. CO2 molecules c. B4H10 molecules d. U atomsarrow_forward
- The active ingredient in Pepto-Bismo® (an over- the-counter remedy for an upset stomach) is bismuth sub-salicylate, C7H5BiO4. Analysis of a 1.7500-g sample of Pepto-Bismol yields 346 mg of bismuth. What percent by mass is bismuth subsalicylate in the sample? (Assume that there are no other bismuth-containing compounds in Pepto-Bismol.)arrow_forward3.96 Methyl cyanoacrylate is the chemical name for the substance sold as Super Glue, and it has the chemical formula C5H5NO2. Calculate the number of molecules of this substance in a 1.0-ounce tube of Super Glue, assuming that the glue is 80% methyl cyanoacrylate by mass.arrow_forwardExpress the composition of each of the following compounds as the mass percents of its elements. a. formaldehyde, CH2O b. glucose, C6H12O6 c. acetic acid, HC2H3O2arrow_forward
- Glycerol, C3H8O3, is used as a moistening agent for candy and is the starting material for nitroglycerin. Calculate the mass of a glycerol molecule in grams.arrow_forwardA gas contains a mixture of NH3(g) and N2H4(g), both of which react with O2(g) to form NO2(g) and H2O(g). The gaseous mixture (with an initial mass of 61.00 g) is reacted with 10.00 moles O2, and after the reaction is complete, 4.062 moles of O2 remains. Calculate the mass percent of N2H4(g) in the original gaseous mixture.arrow_forwardThe molecular formula of acetylsalicylic acid (aspirin), one of the most commonly used pain relievers, is C9H8O4. a. Calculate the molar mass of aspirin. b. A typical aspirin tablet contains 500. mg C9H8O4. What amount (moles) of C9H8O4 molecules and what number of molecules of acetylsalicylic acid are in a 500.-mg tablet?arrow_forward
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