Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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- You have a pure sample of apholate, C12H24N9P3, a highly effective commercial insecticide. Calculate the molar mass of apholate. Calculate the mass of N in 100. g apholate. A sample containing 250.0 mg apholate is sprayed on an agricultural field. Calculate the mass of phosphorus in this sample of apholate; express your result in grams. Calculate the number of phosphorus atoms in this sample of apholate.arrow_forwardDetermine the number of atoms of nitrogen present in each of the following quantities. a. 10.0 g N2H4 b. 20.0 g HN3 c. 30.0 g LiNO3 d. 4.00 moles N2O5arrow_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_forward
- 1. Which of the following hydrocarbons has the highest mass percentage of carbon? methane, CH4 ethane, C2H6 propane, C3H8 butane, C4H10arrow_forwardCalculate, to two decimal places, the formula mass of each of the following substances. Obtain the needed atomic masses from the inside front cover of the text. a. C20H30O (vitamin A) b. C14H9Cl5 (DDT, formerly used as an insecticide) c. C8H10N4O2 (caffeine, a central nervous system stimulant) d. Ca(NO3)2 (calcium nitrate, gives fireworks their red color)arrow_forwardThe structure of one of the bases in DNA, adenine, is shown here. Which represents the greater mass: 40.0 g of adenine or 3.0 1023 molecules of the compound?arrow_forward
- How 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_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_forwardCalculate the molar mass of the following substances. a. b. c. (NH4)2Cr2O7arrow_forward
- Vitamin A has a molar mass of 286.4 g/mol and a general molecular formula of CxHyE, where E is an unknown element. If vitamin A is 83.86% C and 10.56% H by mass, what is the molecular formula of vitamin A?arrow_forwardWhich of the following pairs of compounds have the same empirical formula? a. acetylene, C2H2, and benzene, C6H6 b. ethane, C2H6, and butane, C4H10 c. nitrogen dioxide, NO2, and dinitrogen tetroxide, N2O4 d. diphenyl ether, C12H10O, and phenol, C6H5OHarrow_forwardWhat amount (moles) is represented by each of these samples? a. 150.0 g Fe2O3 b. 10.0 mg NO2 c. 1.5 1016 molecules of BF3arrow_forward
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Step by Step Stoichiometry Practice Problems | How to Pass ChemistryMole Conversions Made Easy: How to Convert Between Grams and Moles; Author: Ketzbook;https://www.youtube.com/watch?v=b2raanVWU6c;License: Standard YouTube License, CC-BY