The molecular formula, line formula, condensed formula, and structural formula of the normal alkane with seven carbon atoms is to be determined. Concept introduction: A given hydrocarbon can be represented using different formulas. It can be represented using structural formula, structural diagram, line formula, condensed formula, or Lewis diagram. Lewis diagram is the representation of the molecule or ion. It shows the bonding between the atoms and also shows the unshared pairs of electrons on an atom if any. The structural formula or structural diagram is nothing but Lewis structure without unshared pairs of electrons. Line formula is the shorthand representation of the Lewis diagram, in which the bond between the parent chain carbon and atoms or other branches from the chain are not shown. Clubbing of CH 2 units together in a line formula gives condensed formula.

Question

There is an instrument in Johnson 334 that measures total-reflectance x-ray fluorescence (TXRF) to do elemental analysis (i.e., determine what elements are present in a sample). A researcher is preparing a to measure calcium content in a series of well water samples by TXRF with an internal standard of vanadium (atomic symbol: V). She has prepared a series of standard solutions to ensure a linear instrument response over the expected Ca concentration range of 40-80 ppm. The concentrations of Ca and V (ppm) and the instrument response (peak area, arbitrary units) are shown below. Also included is a sample spectrum. Equation 1 describes the response factor, K, relating the analyte signal (SA) and the standard signal (SIS) to their respective concentrations (CA and CIS). Ca, ppm V, ppm SCa, arb. units SV, arb. units 20.0 10.0 14375.11 14261.02 40.0 10.0 36182.15 17997.10 60.0 10.0 39275.74 12988.01 80.0 10.0 57530.75 14268.54 100.0…

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Chapter 21, Problem 11E

Interpretation Introduction

Interpretation:

The molecular formula, line formula, condensed formula, and structural formula of the normal alkane with seven carbon atoms is to be determined.

Concept introduction:

A given hydrocarbon can be represented using different formulas. It can be represented using structural formula, structural diagram, line formula, condensed formula, or Lewis diagram. Lewis diagram is the representation of the molecule or ion. It shows the bonding between the atoms and also shows the unshared pairs of electrons on an atom if any. The structural formula or structural diagram is nothing but Lewis structure without unshared pairs of electrons. Line formula is the shorthand representation of the Lewis diagram, in which the bond between the parent chain carbon and atoms or other branches from the chain are not shown. Clubbing of CH2 units together in a line formula gives condensed formula.

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There is an instrument in Johnson 334 that measures total-reflectance x-ray fluorescence (TXRF) to do elemental analysis (i.e., determine what elements are present in a sample). A researcher is preparing a to measure calcium content in a series of well water samples by TXRF with an internal standard of vanadium (atomic symbol: V). She has prepared a series of standard solutions to ensure a linear instrument response over the expected Ca concentration range of 40-80 ppm. The concentrations of Ca and V (ppm) and the instrument response (peak area, arbitrary units) are shown below. Also included is a sample spectrum. Equation 1 describes the response factor, K, relating the analyte signal (SA) and the standard signal (SIS) to their respective concentrations (CA and CIS). Ca, ppm V, ppm SCa, arb. units SV, arb. units 20.0 10.0 14375.11 14261.02 40.0 10.0 36182.15 17997.10 60.0 10.0 39275.74 12988.01 80.0 10.0 57530.75 14268.54 100.0…

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