Concept explainers
One of the particles in an atom is the proton. A proton has a radius of approximately
g. Determine the density of a proton. (Hint: Find the volume of the proton and then divide the mass by the volume to get the density.)
Want to see the full answer?
Check out a sample textbook solutionChapter 2 Solutions
Introductory Chemistry (6th Edition)
- On October 21, 1982, the Bureau of the Mint changed the composition of pennies (see Exercise 120). Instead of an alloy of 95% Cu and 5% Zn by mass, a core of 99.2% Zn and 0.8% Cu with a thin shell of copper was adopted. The overall composition of the new penny was 97.6% Zn and 2.4% Cu by mass. Does this account for the difference in mass among die pennies in Exercise 120? Assume the volume of the individual metals that make up each penny can be added together to give the overall volume of the penny, and assume each penny is the same size. (Density of Cu = 8.96 g/cm3; density of Zn = 7.14 g/cm3).arrow_forwardGold leaf, which is used for many decorative purposes, is made by hammering pure gold into very thin sheets. Assuming that a sheet of gold leaf is 1.27 105 cm thick, how many square feet of gold leaf could be obtained from 28.35 g gold? The density of gold is 19.3 g/cm3.arrow_forwardA solution is prepared by dissolving table salt, sodium chloride, in water at room temperature. a Assuming there is no significant change in the volume of water during the preparation of the solution, how would the density of the solution compare to that of pure water? b If you were to boil the solution for several minutes and then allow it to cool to room temperature, how would the density of the solution compare to the density in part a? c If you took the solution prepared in part a and added more water, how would this affect the density of the solution?arrow_forward
- How many neon atoms are contained in (6.89x10^2) grams of neon? Use at least two decimal places for the molar mass. Report your answer in scientific notation to the correct number of significant figures. Note: Your answer is assumed to be reduced to the highest power possible.arrow_forwardThe radius of an atom of gold (Au) is about 1.35 Å. Part A: Express this distance in nanometers (nm). Express your answer using three significant figures. Part B: Express this distance in picometers (pm). Express your answer using three significant figures. Part C: How many gold atoms would have to be lined up to span 9.5 mm? Express your answer using two significant figures. Part D: If the atom is assumed to be a sphere, what is the volume in cm3 of a single Au atom? Express your answer using three significant figures.arrow_forwardCalculate the surface area in nm^2 of water contained in a watch glass with a diameter of 9.0cm. The area of a circle is calculated as A=r^2(pi) If a molecule of stearic acid covers an area of 0.21 nm^2, how many stearic acid molecules will it take to cover the surface of the watch glass in question 3.arrow_forward
- Lead has a density of 11.34 g/cm^3 and oxygen has a density of 1.31 x 10^-3 g/cm^3 at room temperature. How many cm^3 are occupied by 1g of lead? By 1 g of oxygen? Comment on the difference in volume for the two elements. The Kohinoor Diamond ( d= 3.51 g/cm^3) is 108 carats. If one carat hasa mass of 2.00 x 10^3 mg , what is the mass of the Kohinoor Diamond in pounds? What is the volume of the diamond in cubic Inches? A waterbed filled with water has the dimensions 8.0 ft x 7.0 ft x 0.75 ft. Taking the density of water to be 1.00 g/cm^3,how many kilograms of water are required to fill the waterbed? Vinegar contains 5.00% acetic acid by mass and has a density of 1.01 g/mL. What mass(in grams) of acetic acid is present in 5.00 L of vinegar?arrow_forwardWhat is the mass of a piece of silver metal that has a volume of 17.4 cm^3? (The density of silver metal is 10.5 g/cm^3.)arrow_forwardAn aluminum cylinder is 10.0cm in length and has a radius of 0.25cm. If the mass of a single Al atom is 4.48 x 10^-23 g, calculate the number of Al atoms present in the cylinder. The density of aluminum is 2.70 g/cm^3.arrow_forward
- It has been estimated that 8.0 × 104 tons of gold (Au)have been mined. Assume gold costs $1350 per troyounce. What is the total worth of this quantity of gold?(1 troy ounce = 31.103 g)arrow_forwardTake the mass measurement with nitrogen (28 dalton or atomic mass units per molecule) and the mass measurement with helium (4 daltons per atom) and use the difference between the measured masses to find the mass of 1 dalton (one atomic mass unit) in grams. The standard value of the dalton is 1.66053906660×10−27 kg with an uncertainty of ±50 in the last two figures. Can you identify the sources of error in your measurement?arrow_forwardhe distance between atoms is sometimes given in pico-meters, where 1 pm is equivalent to 1 × 10^–12 m. If the distance between the layers of atoms in a particular compound is given as 568 pm, what is the distance in cm?arrow_forward
- Chemistry & Chemical ReactivityChemistryISBN:9781133949640Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage Learning
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage LearningIntroductory Chemistry: An Active Learning Approa...ChemistryISBN:9781305079250Author:Mark S. Cracolice, Ed PetersPublisher:Cengage Learning