Calculate % composition: Brass is an alloy made of copper and zinc. The density of copper is 8.96 g/mL and the density of zinc is 7.14 g/mL. If the density of a sample of brass is 8.72 g/mL, what is the percent copper in the brass?
Hint: “Grandma’s chocolates” are composed of a caramel center and a chocolate coating. The measured density of a “Grandma’s chocolate” is 1.045 g/cm3. Knowing that the density of her caramel is 1.160 g/cm3 and that of her chocolate coating is 0.960 g/cm3, the percent by mass of caramel in a “Grandma’s chocolate” can be found from the equation given below. d(“Grandma’s chocolates”) = d(caramel)×(% caramel) + d(chocolate)×(1 ‒ % caramel) where d is density in g/mL, and % caramel is the % by mass (expressed as a decimal) of caramel in a “Grandma’s chocolate.” Since these are the only two components, (1 ‒ % caramel) is the % by mass of chocolate in a “Grandma’s chocolate.” So for the values given: 1.045 g/mL = 1.160 g/mL ´(% caramel) + 0.960 g/mL ´(1 ‒ % caramel) Solving gives % caramel = 0.425 (or 42.5%) (and % chocolate = 57.5%) Hint 2: Answer includes 3 significant figures.
Calculate % composition: Brass is an alloy made of copper and zinc. The density of copper...
Common brass is a copper and zinc alloy containing 37.0% zinc by mass and having a density of 8.48 g/cm3. A fitting composed of common brass has a total volume of 126.5 cm3 . How many atoms of copper does the fitting contain? How many atoms of zinc does the fitting contain?
Brass is a metallic alloy of copper and zinc. The relative percentages of copper and zinc determine the properties of the brass; resistance to corrosion and malleability, for example, are dependent on the relative amounts of copper and zinc. The percentage of zinc within a sample of brass may be determined using the techniques encountered in this experiment. 1. A 0.3400 g piece of brass is allowed to react with hydrochloric acid at the base of eudiometer. The hydrogen gas...
Brass is an alloy of copper and zinc. Varying the mass percentages of the two metals produces brasses with different properties. A brass called yellow zinc has high ductility and strength and is 34.0%−37.0% zinc by mass. (a) Find the mass range (in g) of copper in 487 g of yellow zinc. (b) What is the mass range (in g) of zinc in a sample of yellow zinc that contains 48.5 g of copper?
Calculate the mass of copper in grams (density = 8.96 g/cm3) with the same volume as 100.0 grams of gold (density = 19.31 g/cm3).
The density experiment involves taking average mass and displaced volume measurements for multiple samples of metal. A student ascertained that the identity of their unknown metal was zinc (d 7.14 g/mL). However, upon consulting their teaching assistant, they learned that the true identity of the metal was copper (d = 8.96 g/mL). What error could the student have made when performing the experiment that would have led to the student's original conclusion? 7.
Red gold is a gold‑copper alloy used to make jewelry. A piece of jewelry made of red gold weighs 8.35 g and has a volume of 0.581 cm3. Gold has a density of 19.3 g/cm3 and copper has a density of 8.96 g/cm3. Calculate the percentage by mass of each metal in the jewelry. Assume the total volume of the jewelry is the sum of the volumes of the two metals it contains. gold: % : copper: % : Pure...
Red gold is a gold‑copper alloy used to make jewelry. A piece of jewelry made of red gold weighs 8.80 g and has a volume of 0.594 cm3. Gold has a density of 19.3 g/cm3 and copper has a density of 8.96 g/cm3 . Calculate the percentage by mass of each metal in the jewelry. Assume the total volume of the jewelry is the sum of the volumes of the two metals it contains. gold: % copper: % Pure gold...
Red gold is a gold‑copper alloy used to make jewelry. A piece of jewelry made of red gold weighs 7.47 g and has a volume of 0.482 cm3 . Gold has a density of 19.3 g/cm 3 and copper has a density of 8.96 g/cm3 . Calculate the percentage by mass of each metal in the jewelry. Assume the total volume of the jewelry is the sum of the volumes of the two metals it contains. gold= % Copper= %...
25. The density of copper is about 8.96 g/mL. This means that a certain mass of copper will: a) Occupy the same volume as the same mass of water b Occupy a volume 8.96 times larger than the volume occupied by the same mass of water c) Occupy a volume that is 8.96 times smaller than the volume occupied by the same mass of water d) Always occupy a volume of 8.96 ml 26. 164.0 g of a substance occupy...
Q3) A drug compound for anticancer treatment, Platinol has a base structure of Pt(NH3)2Cl2. A variant form of the drug has the formula Pt2(NH3)4Cl3. For the variant form, calculate the mass percent of platinum. hint: Molar masses used Pt 195.084g/mol, N 14.0067g/mol, H 1.008g/mol, and Cl 35.453 g/mol. Q4) When Barium (density is 3.5 g/mL) reacts with sulfur (density is 2.04 g/mL) to form barium sulfide, each barium atom reacts with one sulfur atom. The mass ratio of barium to...