19 Which of the following most accurately models the relationship between compounds and elements? A Key Compounds Elements C 20 Based on the key, which of these models a compound? F Key Oxygen (O) G Sodium (Na) Nitrogen (N)

19 Which of the following most accurately models the relationship between compounds and elements? A Key Compounds Elements C 20 Based on the key, which of these models a compound? F Key Oxygen (O) G Sodium (Na) Nitrogen (N)

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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The human body contains many elements from the periodic table. It is mostly composed of oxygen and carbon, but trace elements also have a significant role. The table gives the mass, in kilograms, of some elements found in the human body, based on a 70.070.0 kg person. Atomic number Element Mass (kg) 88 oxygen 45.245.2 66 carbon 12.612.6 11 hydrogen 7.07.0 77 nitrogen 2.22.2 2020 calcium 1.31.3 1515 phosphorus 0.780.78 1919 potassium 0.250.25 1616 sulfur 0.180.18 others 0.600.60 total 70.070.0 Hydrogen makes up what fraction of the mass of the human body? Hydrogen makes up what percentage of the mass of the human body? What is the mass of phosphorus in a 2323 kg person?
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A compound is 32.88% C, 4.14% H, 19.18% N and 43.80% O by mass, and it has a molar mass of 219 g/mol. What is the molecular formula of this compound? When entering the formula place the elements in the following order: C, H, N, O. For subscripts, write the number after the element it corresponds to. For example, H2O should be written as H2O.
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