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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
- The 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_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
- An 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_forwardA 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_forward
- Chemists 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_forward6.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_forward
- The 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_forwardCalculate the radius in nanometers of a metallic atom given that it has a BCC structure and a density of 12.81 g/cm3 and an atomic weight of 110.9 g/mol. NA = 6.022 x 1023 atoms/mol. Express your answer in three decimal places only. Do not put the units. Add your answerarrow_forwardMatter is neither created nor destroyed in a chemical reaction. Thus, the mass of the products of a chemical reaction must be equal to the mass of the starting materials. Formally, this concept is called the law of conservation of mass. A sample of sodium reacts completely with 0.426 kg k g of chlorine, forming 702 g g of sodium chloride. What mass of sodium reacted?arrow_forward
- Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning