In 1999, scientists discovered a new class of black holes with masses 100 to 10,000 times the mass of our sun, but occupying less space than our moon. Suppose that one of these black holes has a mass of 9×1039×103 suns and a radius equal to one-half the radius of our moon. What is its density in grams per cubic centimeter? The mass of the sun is 2.0×1030kg2.0×1030kg and the radius of the moon is 2.16×103mi2.16×103mi. (Volume of a sphere =43πr343πr3.)

Q: It has been estimated that 8.0 × 104 tons of gold (Au)have been mined. Assume gold costs $1350 per…

A: Given that : Mass of gold = 8.0×104 tons Cost of gold = $1350 per troy ounce Worth of gold =? (1…

Q: A student measures the mass of a piece of aluminum, and finds it to be 8.945 g. She finds that the…

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Q: A scientist removed a sample of 37.8 grams of a chemical from a container. The sample was 4 1/4 less…

A: Given the mass of the sample removed out of the total mass = 37.8 g  Suppose the total mass of the…

Q: A sample is found to contain 8.47×10-6 g of salt. Express this quantity in nanograms.

A: Given that Mass of sample (salt) = 8.47 × 10-6 g Mass of sample  = ? ng

Q: The concentration of mercury in a polluted lake is 0.33 micrograms per liter of water. What is the…

A: Given,Volume of the lake = 1.5 x 1012cm30.33 micrograms per liter of water

Q: eral contains 5.032 % of a precious metal, by mass. The precious metal as a density of 3.681 g/cm°.…

A: Density = 3.681 g/cm3  Mass % of metal mineral = 5.032%  Density = mass/volume

Q: In a laboratory, you determine that the density of a certain solid is 5.23 x 10 ° kg/mm. Convert…

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Q: Chlorine is used to disinfect swimming pools. The accepted concentration for this purpose is 1 ppm…

A: Given : Mass of water in swimming pool = 8.45 X 104 gallons  Mass percent of chlorine = 6.00 %  And…

Q: A piece of metal that is a cube with sides of 1.66 cm has a mass of 69.000 g.  Calculate the density…

A: TO calculate the density of the metal, first of all we determine the volume of the metal cube.

Q: The density of silver (Ag) is 10.5 g/mL. Determine the mass in kilograms of Ag that will occupy 345…

A: The density of silver (Ag) given is 3.62 g/mL.The volume of Ag given is 345 mL.To find the mass of…

Q: A sample is found to contain 9.75×109 g of salt. Express this quantity in milligrams.

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Q: A homogeneous mixture was prepared by mixing 0.90 g A, 105.7 g B and 48.17 g C. The volume is found…

A: Given, Volume of mixture = 56.6 cm3 Mass of A = 0.90 g Mass of B = 105 .7 g Mass of C = 48.17 g

Q: If a sample of unknown substance has a mass of 3.10 kg and a volume of 1.80 L, what is the density…

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Q: A bottle of sodium hydroxide (NaOH) was found to contain 1.23 lb of this chemical. Express the…

A: The conversion factor can be described as the numerical factor that is used to convert one set of…

Q: mol aqueous L A chemist must prepare 875. mL of 10.0 mM aqueous calcium sulfate (CaS0,) working…

A: On dilution, the concentration of solution decreases but the number of moles remain constant. Write…

Q: An atom of a particular element has a volume of 7.8 x 10-31 m3. What is this volume in cubic…

A: An atom is always neutral because of the equal number of electrons and protons. Electrons are…

Q: The mass of Earth is 5.98 ×10^24kg. What is the mass expressed in tera-grams?

A: Given: The mass of the earth = 5.98×1024 kg We have to find the mass in teragrams.

Q: The volume of water in large scale reservoirs is often measured in units of an acre-foot, which is…

A: 1 acre-foot = 43,560 ft³ 1 US liquid gallon = 231 cubic inches 1 US liquid gallon = 3.785 liters 1…

Q: Gold is a very soft metal that can be hammered into extremely thin sheets known as gold leaf. If a…

A: The average thickness of the sheet produced from given grams of gold is calculated as shown below

Q: the density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm^3.…

A: The density of mercury is given as 13.6 g/cm3 and it is required to convert this in pounds per cubic…

Q: what mass (in g) of solid lead would displace exactly 234.6 liters of water? The density of the lead…

A: Given : density of lead = 11.4 g/cm3                                                 Volume of water…

Q: You are trying to determine the density of a piece of metal. You use a balance and find that the…

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Q: A chemist must dilute 15.5 mL of 441. mM aqueous potassium permanganate (KMnO4) solution until the…

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Q: The shattered glass case at the scene of a jewelry store robbery was determined to be made of potash…

A: Density of any substance can be defined as the ratio of the mass of the substance to its volume. It…

Q: An atom of rhodium (RhRh) has a diameter of about  2.7×10−8cm2.7×10−8cm.   Part A: What is the…

A: "Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: Atoms are the smallest spherical particles that make up any matter. If 6.0x10^23 atoms of aluminum…

A: Avogadro’s number is used to determine the number of atoms present in 1 mol of an element.…

Q: The volume of a single barium atom is 4.29 x 10 μL cm³. What is the volume of a barium atom in…

A: We know that the relationship between cubic centimeter (cm3) and microliter(µL) is :1 cm3 = 1000 µL

Q: What is the area in cm² of a sheet of paper that is 8.50 in x 11.0 in?

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Q: The mass of a uranium atom is 3.9526 × 10-22 grams. What is this value in nanograms? In your…

A: The mass of uranium atom = 3.9526×10–22 grams

Q: The volume of a metal bar can be determined by immersing it in water in a graduated cylinder and…

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Q: A gold cube is 150.00 mm long, 10.00 cm wide, and 0.95 m thick. If gold has a density of 19.3g/cm^3,…

A: The density of any substance is defined as the ratio of its mass to the volume of the substance.

Q: A student reported the mass of ten glass beads as 2.507 ± 0.015 g. What should the student report as…

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Q: 8) To determine the volume of an irregular shaped object, it is dropped into a graduate cylinder…

A: The objective of the question is to calculate the density of an irregular shaped object using the…

Q: What is the volume (in units of m^3) and density (in units of g/mL) of a 325g rectangular block of…

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Q: Chlorine is used to disinfect swimming pools. The accepted concentration for this purpose is 1 ppm…

A: The values are given as follows:

Q: Determine the density (in g/cm3) of a metal alloy (a mix of metals) that has a mass of 56.68g and…

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Q: In 1993 the Minnesota Department of Health set a health risk limit for BCME in groundwater of 2.00…

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Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.