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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Iron pyrite is often called “fool's gold” because it looks like gold (see page 11). Suppose you have a solid that looks like gold, but you believe it to be fool's gold. The sample has a mass of 23.5 g. When the sample is lowered into the water in a graduated cylinder (Study Question 63), the water level rises from 47.5 mL to 52.2 mL. Is the sample fool's gold (d = 5.00 g/cm3) or “real” gold (d = 19.3 g/cm3)?

Interpretation Introduction

Interpretation:

The sample has to be identified as fool gold or real gold.

Concept Introduction:

Density: Is a characteristic property of a substance.  The density of a substance is the relationship between the mass of the substance and how much space it takes up (volume).

  Density = MassVolume

Explanation

The density of the sample is calculated as,

  Calculate the density:_Given: Mass = 23.5 g ;             Volume = final volume - initial volume                         = (52.2 - 47.5) ml = 4

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