Concept explainers
Calculate the average density of a single Al-27 atom by assuming that it is a sphere with a radius of 0.143 nm. The masses of a proton, electron, and neutron are
2.70 g/cm3. What does that suggest about the packing of aluminum atoms in the metal?
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Chapter 2 Solutions
Chemistry: Principles and Reactions
- Which of these statements are qualitative? Which are quantitative? Explain your choice in each case. (a) Sodium is a silvery-white metal. (b) Aluminum melts at 660 C. (c) Carbon makes up about 23% of the human body by mass. (d) Pure carbon occurs in different forms: graphite, diamond, and fullerenes.arrow_forwardThe present average concentration (mass percent) of magnesium ions in seawater is 0.13%. A chemistry textbook estimates that if 1.00 × 108 tons Mg were taken out of the sea each year, it would take one million years for the Mg concentration to drop to 0.12%. Do sufficient calculations to either verify or refute this statement. Assume that Earth is a sphere with a diameter of 8000 mi, 67% of which is covered by oceans to a depth of 1 mi, and that no Mg is washed back into the oceans at any time.arrow_forwardWhat is the mass (in kg) of 6.89 × 10^25 molecules of carbon dioxide? Give the answer as a number. The units are understood to be kg.arrow_forward
- Calculate 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_forwardAn atom of rhodium (Rh) has a diameter of about 2.7×10−8cm2.7×10−8cm If the atom is assumed to be a sphere, what is the volume in m3m3 of a single Rh atom? Express your answer using two significant figures.arrow_forwardCalculate the radius in nanometers of a metallic atom given that it has a BCC structure and a density of 12.63 g/cm3 and an atomic weight of 107.13 g/mol. = 6.022 x 1023 atoms/mol. Express your answer in three decimal places NA only. Do not put the units.arrow_forward
- A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is the density of concentrated sulfuric acid?arrow_forwardChemists have determined that 18.0 g of water consists of 6.02 x 10 23 molecules. Determine the number of water molecules a one quart container can hold. ( 1 quart = 946.35 g )arrow_forwardCalculate the radius in nanometers of a metallic atom given that it has a BCC structure and a density of 11.58 g/cm3 and an atomic weight of 104.24 g/mol. NA = 6.022 x 1023 atoms/mol. Express your answer in three decimal places only. Do not put the units.arrow_forward
- 6.Express your answers to at least 5 significant figures. The mass of one mole of boron is 10.811 g. (a) What is the mass in u of one boron atom? answer was 10.81 (b) What is the mass in kg of one boron atom? ___x10^_____arrow_forwardThe density of gold metal is 19.3 g/cm3, while that for silver is 10.5 g/cm3. Suppose you had the same size bar of each metal, with the dimensions 2.00 in x 10.0 cm x 760 mm. Volume of a cube is height x length x width. Which bar would have the greatest mass? Which bar contains the greater number of atoms? If the two bars were melted and mixed together to form an alloy (or mixture) what would be the total mass?arrow_forwardThere is one mole of water in the beaker. A student measured the weight of the 1 mole of water of 18.02 g after using scale. Calculate the molar mass of water (H2O) in grams using your periodic table. [1 amu = 1.6606×10−24?1.6606×10−24g ]. How does your answer compare to the student's measurement? What can you conclude?arrow_forward
- Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning