Explanation (1) Density ( d ) is defined as mass per unit volume. d = m / V Here, m is the mass and V is the volume. Rearrange this equation to calculate the mass of the Sun. m = V × d …….… (1) Calculate the mass of the Sun as follows: m = ( 4 3 ×π× ( 7×10 8 m ) 3 ) × ( 1 .4 g/cm 3 ) ( 1 cm 3 1×10 -6 m 3 ) =2 .0×10 33 g (2) Calculate the number of atoms of hydrogen in the Sun as follows: n (H)= mass of H molar mass of H ×Avogadro's number = ( 2 .0×10 33 g 1

Principles Of Chemistry: A Molecular Approach, Loose-leaf Edition (4th Edition)

4th Edition

ISBN: 9780134989099

Author: Nivaldo J. Tro

Publisher: PEARSON

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.

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Chapter 2, Problem 125E

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Interpretation: The number of atoms in the universe is to be calculated by the use of the given assumptions.

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Chapter 2, Problem 124E

Chapter 2, Problem 126E

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In the video, we looked at the absorbance of a certain substance and how it varies depending on what wavelength of light we are looking at. Below is a similar scan of a different substance. What color BEST describes how this substance will appear? Absorbance (AU) Violet Blue Green Orange 1.2 1.0- 0.8- 0.6- 0.4- 0.2 0.0 450 500 550 600 650 700 Wavelength (nm) violet indigo blue green yellow orange red Red O Cannot tell from this information In the above graph, what causes -450 nm wavelength of light to have a higher absorbance than light with a -550 nm wavelength? Check all that are true. The distance the light travels is different The different data points are for different substances The concentration is different at different times in the experiment Epsilon (molar absortivity) is different at different wavelengths

5. a. Data were collected for Trial 1 to determine the molar mass of a nonvolatile solid solute when dissolved in cyclo- hexane. Complete the table for the analysis (See Report Sheet). Record calculated values with the correct number of significant figures. B. Freezing Point of Cyclohexane plus Calculation Zone Unknown Solute 2. Mass of cyclohexane (g) 10.14 Part C.4 3. Mass of added solute (g) 0.255 C. Calculations 1. k; for cyclohexane (°C⚫ kg/mol) 20.0 2. Freezing point change, AT, (°C) 3.04 Part C.6 3. Mass of cyclohexane in solution (kg) 4. Moles of solute, total (mol) Show calculation. 5. Mass of solute in solution, total (g) 6. Molar mass of solute (g/mol) Show calculation.

Chapter 2 Solutions

Principles Of Chemistry: A Molecular Approach, Loose-leaf Edition (4th Edition)

Ch. 2 - Q1. Two samples of a compound containing elements...Ch. 2 - Q2. A compound containing only carbon and hydrogen...Ch. 2 - Prob. 3SAQ Ch. 2 - Q4 A student recreates the Millikan’s oil drop...Ch. 2 - Q5. Determine the number of protons and neutrons...Ch. 2 - Prob. 6SAQ Ch. 2 - Prob. 7SAQ Ch. 2 - Prob. 8SAQ Ch. 2 - Prob. 9SAQ Ch. 2 - Prob. 10SAQ

Ch. 2 - Prob. 11SAQ Ch. 2 - Prob. 12SAQ Ch. 2 - Q13. Determine the number of atoms in 1.85 mL of...Ch. 2 - Prob. 14SAQ Ch. 2 - Prob. 15SAQ Ch. 2 - 1. What is Brownian motion? How is it related to...Ch. 2 - 2. Summarize the history of the atomic idea. How...Ch. 2 - 3. State and explain the law of conservation of...Ch. 2 - 4. State and explain the law of definite...Ch. 2 - Prob. 5E Ch. 2 - Prob. 6E Ch. 2 - Prob. 7E Ch. 2 - 8. Explain Millikan’s oil drop experiment and how...Ch. 2 - Prob. 9E Ch. 2 - 10. Describe the Rutherford’s gold foil...Ch. 2 - 11. Describe Rutherford’s nuclear model of the...Ch. 2 - 12. If matter is mostly empty space, as suggested...Ch. 2 - Prob. 13E Ch. 2 - Prob. 14E Ch. 2 - Prob. 15E Ch. 2 - Prob. 16E Ch. 2 - 17. What are isotopes? What is the percent natural...Ch. 2 - 18. Describe the two different notations used to...Ch. 2 - Prob. 19E Ch. 2 - Prob. 20E Ch. 2 - Prob. 21E Ch. 2 - Prob. 22E Ch. 2 - Prob. 23E Ch. 2 - Prob. 24E Ch. 2 - Prob. 25E Ch. 2 - Prob. 26E Ch. 2 - Prob. 27E Ch. 2 - 28. Why is the mass corresponding to a mole of one...Ch. 2 - 29. A hydrogen-filled balloon is ignited and 1.50...Ch. 2 - 30. An automobile gasoline tank holds 21 kg of...Ch. 2 - Prob. 31E Ch. 2 - 32. Two samples of sodium chloride are decomposed...Ch. 2 - Prob. 33E Ch. 2 - Prob. 34E Ch. 2 - Prob. 35E Ch. 2 - Prob. 36E Ch. 2 - Prob. 37E Ch. 2 - 38. Sulfur and fluorine form several different...Ch. 2 - 39. Which statements are consistent with Dalton’s...Ch. 2 - 40. Which statements are inconsistent with...Ch. 2 - 41. Which statements are consistent with...Ch. 2 - Prob. 42E Ch. 2 - 43. A chemist in an imaginary universe, where...Ch. 2 - Prob. 44E Ch. 2 - 45. On a dry day, your body can accommodate static...Ch. 2 - Prob. 46E Ch. 2 - 47. Which statements about subatomic particles are...Ch. 2 - Prob. 48E Ch. 2 - 49. How many electrons does it take to equal the...Ch. 2 - Prob. 50E Ch. 2 - 51. Write isotopic symbols in the form X-A (e.g.,...Ch. 2 - Prob. 52E Ch. 2 - Prob. 53E Ch. 2 - 54. Determine the number of protons and the number...Ch. 2 - Prob. 55E Ch. 2 - Prob. 56E Ch. 2 - Prob. 57E Ch. 2 - 58. Determine the number of protons and the number...Ch. 2 - Prob. 59E Ch. 2 - 60. Predict the charge of the ion formed by each...Ch. 2 - Prob. 61E Ch. 2 - Prob. 62E Ch. 2 - Prob. 63E Ch. 2 - Prob. 64E Ch. 2 - Prob. 65E Ch. 2 - Prob. 66E Ch. 2 - Prob. 67E Ch. 2 - Prob. 68E Ch. 2 - 69. Which pair of elements do you expect to be...Ch. 2 - 70. Which pair of elements do you expect to be...Ch. 2 - 71. Gallium has two naturally occurring isotopes...Ch. 2 - Prob. 72E Ch. 2 - Prob. 73E Ch. 2 - Prob. 74E Ch. 2 - Prob. 75E Ch. 2 - 76. An element has four naturally occurring...Ch. 2 - 77. Bromine has two naturally occurring isotopes...Ch. 2 - 78. Silicon has three naturally occurring isotopes...Ch. 2 - 79. Use the mass spectrum of europium to determine...Ch. 2 - 80. Use the mass spectrum of rubidium to determine...Ch. 2 - 81. How many sulfur atoms are there in 5.52 mol of...Ch. 2 - Prob. 82E Ch. 2 - Prob. 83E Ch. 2 - Prob. 84E Ch. 2 - Prob. 85E Ch. 2 - Prob. 86E Ch. 2 - 87. Calculate the number of atoms in each...Ch. 2 - 88. Calculate the number of atoms in each...Ch. 2 - 89. Calculate the mass, in grams, of each...Ch. 2 - Prob. 90E Ch. 2 - Prob. 91E Ch. 2 - Prob. 92E Ch. 2 - 93. Calculate the average mass, in grams, of one...Ch. 2 - 94. Using scanning tunneling microscopy,...Ch. 2 - 95. A 7.83 g sample of HCN contains 0.290 g of H...Ch. 2 - Prob. 96E Ch. 2 - 97. The ratio of oxygen to carbon by mass in...Ch. 2 - 98. The ratio of the mass of a nitrogen atom to...Ch. 2 - Prob. 99E Ch. 2 - Prob. 100E Ch. 2 - Prob. 101E Ch. 2 - Prob. 102E Ch. 2 - Prob. 103E Ch. 2 - Prob. 104E Ch. 2 - 105. Fill in the blanks to complete the...Ch. 2 - Prob. 106E Ch. 2 - 107. Carbon-12 contains six protons and six...Ch. 2 - 108. A penny has a thickness of approximately 1.0...Ch. 2 - 109. Consider the stack of pennies in the previous...Ch. 2 - Prob. 110E Ch. 2 - Prob. 111E Ch. 2 - Prob. 112E Ch. 2 - 113. A pure copper sphere has a radius of 0.935...Ch. 2 - Prob. 114E Ch. 2 - Prob. 115E Ch. 2 - 116. Boron has only two naturally occurring...Ch. 2 - Prob. 117E Ch. 2 - Prob. 118E Ch. 2 - Prob. 119E Ch. 2 - 120. Naturally occurring chlorine is composed of...Ch. 2 - Prob. 121E Ch. 2 - 122. The US Environmental Protection Agency (EPA)...Ch. 2 - 123. Pure gold is usually too soft for jewelry, so...Ch. 2 - Prob. 124E Ch. 2 - Prob. 125E Ch. 2 - 126. On the previous page is a representation of...Ch. 2 - Prob. 127E Ch. 2 - Prob. 128E Ch. 2 - Prob. 129E Ch. 2 - Prob. 130E Ch. 2 - Prob. 131E Ch. 2 - 132. Which answer is an example of the law of...Ch. 2 - 133. Lithium has two naturally occurring isotopes:...Ch. 2 - 134. As we saw in the previous problem, lithium...Ch. 2 - Prob. 135E Ch. 2 - Prob. 136E Ch. 2 - Prob. 137E Ch. 2 - Prob. 138QGW Ch. 2 - Prob. 139QGW Ch. 2 - Prob. 140QGW Ch. 2 - Prob. 141QGW Ch. 2 - 142. Demand for recycled paper has increased as...

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