Concept explainers
(a)
Interpretation:
The number of molecules in
(b)
Interpretation:
The number of molecules in
(c)
Interpretation:
The number of molecules in
(d)
Interpretation:
The number of molecules in
(e)
Interpretation:
The number of molecules in
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EBK INTRODUCTION TO CHEMISTRY
- What 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_forward3.55 An average person inhales roughly 2.5 g of O2 in a minute. How many molecules of oxygen are inhaled in (a) 1 minute, (b) 1 hour, (c) 1 day by an average person?arrow_forwardHigh-density lipoprotein (HDL) cholesterol is the good cholesterol because adequate levels reduce the risk of heart disease and stroke. HDL levels between 40. and 59 mg/dL are typical for a healthy individual. What is this range of HDL cholesterol in units of mol/L? The formula for cholesterol is C27H46O.arrow_forward
- 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_forwardA compound was analyzed and found to contain the following percentages of elements by mass: carbon, 79.89%; hydrogen, 20.11%. l type='a'> Determine the empirical formula of the compound. i>Which of the following could be a molar mass of the compound? 13.018 g/mol 16.042g/mol 28.052 g/mol 30.068 g/mol 104.23 g/rnolarrow_forwardA major textile dye manufacturer developed a new yellow dye. The dye has a percent composition of 75.95% C, 17.72% N, and 6.33% H by mass with a molar mass of about 240 g/mol. Determine the molecular formula of the dye.arrow_forward
- A 12.1-g sample of Na2SO3 is mixed with a 14.6-g sample of MgSO4. What is the total mass of oxygen present in the mixture?arrow_forwardCacodyl, a compound containing arsenic, was reported in 1842 by the German chemist Robert Wilhelm Bunsen. It has an almost intolerable garlic-like odor. Its molar mass is 210 g/mol, and it is 22.88% C, 5.76% H, and 71.36% As. Determine its empirical and molecular formulas.arrow_forwardmany molecules are contained in each compound? a. 1.35 mol of carbon disulfide (CS2) b. 0.254 mol of diarsenic trioxide (As2O3) How c. 1.25 mol of water d. 150.0 mol of HCl Determine the number of moles in each substance. a. 3.25 x 1020 atoms of lead b. 4.96 x 1024 molecules of glucose c. 1.56 x 1023 formula units of sodium hydroxide d. 1.25 x 1025 copper(II) ions Perform the following conversions. a. 1.51 x 1015 atoms of Si to mol of Si b. 4.25 x 10-2 mol of H2SO4 to molecules of H,SO4 c. 8.95 x 1025 molecules of CCl, to mol of CCI4 d. 5.90 mol of Ca to atoms of Caarrow_forward
- A. Molar mass of an Element = Atomic mass of the Element Molar mass of a Compound = Molecular mass of the Compound Element Atomic Mass Molar Mass 12.01 g/mol 23.0 g/mol Examples: C 12.01 amu Na 23.0 amu Examples: Compound Number Molecular Mass Molar Mass of Atoms CO2 C -1 C-1x 12.01 (atomic mass of C) 12.01 amu %3D O-2 O-2x16.00 (atomic mass of O) = 32.00 amu 44.01 g/mol 44.01 amu Pt 1 x 195.08 = 195.08 amu CI - 2 x 35.45 = 70.9 amu = 28.02 amu 6.06 amu Pt 1 CI- 2 PIC2(NH3)2 N-2 N-2 x 14.01 300.06g g/mol H-6 H-6x 1.01 %3D Total 300.06 amuarrow_forwarda. A 9.475 gram sample of copper is heated in the presence of excess chlorine. A metal chloride is formed with a mass of 20.05 g. Determine the empirical formula of the metal chloride. b. A 23.11 gram sample of manganese is heated in the presence of excess bromine. A metal bromide is formed with a mass of 90.32 g. Determine the empirical formula of the metal bromide.arrow_forwardWhat is the mass of 5.45 x 10 -3 mol of glucose C 6 H 12 O 6 ? O a. 981 g O b.0.981 g O c. 0.158 g O d.3.03 x 10-5 garrow_forward
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