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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Urea, chemical formula (NH2)2CO, is used for fertilizer and many other things. Calculate the number of N, C, O, and H atoms in 1.58 × 104 g of urea. Enter your answers in scientific notation.
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- Crime scene investigators keep a wide variety of compounds on hand to help with identifying unknown substances they find in the course of their duties. One such investigator, while reorganizing their shelves, has mixed up several small vials and is unsure about the identity of a certain powder. Elemental analysis of the compound reveals that it is 67.31 % carbon, 6.978% hydrogen, 4.617% nitrogen, and 21.10% oxygen by mass. Which of the compounds could the powder be? C17H19NO3C17H19NO3 = morphine, analgesic C17H21NO4C17H21NO4 = cocaine, illicit drug C7H5N3O6C7H5N3O6 = 2,4,6-trinitrotoluene (TNT), commonly used explosive C10H15NC10H15N = methamphetamine, stimulant C4H5N2OC4H5N2O = caffeine, stimulant C11H15NO2C11H15NO2 = 3,4-methylenedioxymethamphetamine (MDMA), illicit drug C21H23NO5C21H23NO5 = heroin, illicit drug C3H6NO3C3H6NO3 = hexamethylene triperoxide diamine (HMTD), commonly used explosivearrow_forwardPart A: What is the molar mass of allicin? Express your answer in grams per mole to four significant figures.arrow_forwardHow many chloride atoms are in 32.3 g of CaCl2? write the answer in this format 1.00x10^1 unit Cl What is the mass percent carbon in benzoic acid, C6H5COOH?arrow_forward
- Be sure to answer all parts. Potassium is the second most abundant metal in the human body. Calculate the following: (a) The number of atoms in 7.11 moles of potassium. X 10 atoms Enter your answer in scientific notation. (b) The number of moles of potassium that contains 9.11 × 1025 atoms. x 10 mol Enter your answer in scientific notation.arrow_forwardWhich copper ore contains the highest percentage of copper by weight? Mathematically document your answer (Cu=63.5; S=32.0; O=16.0; H=1.00; C=12.0) Brochantite CuSO4 x 3 Cu(OH)2 or Azurite 2 CuCO3 x Cu(OH)2 ?arrow_forwardYou are given a 15.0 g mixture. You find out that the mixture contains 3.55 g salt, 4.78 g sand and the rest is Iron. According to these data, what is the percent of iron in the mixture? O 55.5% O 6.67% O 44.5% 15,0%arrow_forward
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