A chemistry student needs 40.0mL of pentane for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of pentane is ·0.626gcm−3 . Calculate the mass of pentane the student should weigh out. Be sure your answer has the correct number of significant digits.

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 chemist prepares a solution of potassium iodide (KI) by weighing out 25.38 g of potassium iodide…

A: Mass of potassium Iodide = 25.38 g Volume of water = 100. mL The concentration is needed in the unit…

Q: A chemist must dilute 78.3 mL of 9.91 mM aqueous calcium sulfate (CaSO4) solution until the…

A: For dilution, we can use the formula:Here, M1 = molarity of the original solutionV1 = volume of the…

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: A chemistry student needs 60.0 g of tetrahydrofuran for an experiment. By consulting the CRC…

A: The density is an intrinsic property that given the mass of an object per unit volume.…

Q: A chemistry student needs 70.0 g of tetrahydrofuran for an experiment. By consulting the CRC…

A:

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: A chemistry student needs 15.0mL of tetrahydrofuran for an experiment. By consulting the CRC…

A:

Q: An instrument used to detect metals in drinking water can detect as  little as 1 μg of mercury in 1…

A: According to this question, Using formulas are  No.of atoms in V Ltrs of water = mass in V Ltrs…

Q: the density of gallium triiodide, Gal, is 4.15g/cm^3. If the initial volume of water in a graduated…

A: The volume of the water increased after adding the crystal of gallium triiodide can be calculated…

Q: hemist must dilute 95.2 mL of 1.14 mM aqueous magnesium fluoride (MgF₂) solution until the…

A:

Q: A chemist adds  925.0mL  of a  /0.00469gL  copper(II) fluoride  CuF2  solution to a flask.…

A:

Q: A chemistry student needs 30.0 g of diethylamine for an experiment. By consulting the CRC Handbook…

A: Ans

Q: A chemistry student needs 40.0 mL of glycerol for an experiment. By consulting the CRC Handbook of…

A: Given  Volume of glycerol = 40 mL  density of glycerol  = 1.26 gram cm-3 or 1.26 gram/cm3 Mass of…

Q: A chemist adds 70.0mL of a 2.40 x 10^−4 mol/L copper(II) fluoride (CuF2) solution to a reaction…

A: Given: The volume of copper(II) fluoride (CuF2) solution added = 70.0 mL The molarity of the…

Q: A chemist must dilute 73.5 mL of 3.19 M aqueous zinc nitrate (Zn . She'll do this by adding…

A: (Before dilution) Initial volume of aqueous zinc nitrate Zn(NO3)2 solution = V1 = 73.5 mL  (1mL =…

Q: A chemistry student needs 45.0 mL of diethmylamine for an experiment. By consulting  the CRC…

A: Given,Volume of diethylamine = 45.0 mL = 45.0 cm3         (1mL = 1cm3)Density of diethylamine =…

Q: A chemist must dilute 44.5 mL of 443. mM aqueous copper(II) sulfate (CuSO4) solution until the…

A:

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: A chemistry student needs  10.0g  of methyl acetate for an experiment. By consulting the CRC…

A: Density is a mass per volume ratio. The average density is similar to the total volume of an object.…

Q: Carbon

A: Avogadro's  number gives the number of atoms, molecules or ions in one mole of the substance and it…

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

A:

Q: A chemist prepares solution of nickel(II) chloride (NiC1₂) by weighing out 202.7 g of nickel(II)…

A: Given: mass = 202.7 g

Q: Iron has a density of 7.874 g/cm^3.What is the mass of a rectangular block of iron with dimensions…

A: Density of a substance is given by the ratio of mass of the substance to its volume. Density =…

Q: A chemist adds 0.75 L of a 0.0229 g/L mercury(II) iodide (HgI₂) solution to a flask. Calculate the…

A: The concentration of any solution can be given by its molarity, molality, strength and normality.…

Q: A chemist prepares a solution of sodium hyposulfate (Na₂S₂O3) by measuring out 256. μmol of sodium…

A: Check the formula for calculation of the concentration and then use it to calculate the molarity of…

Q: chemistry student needs  85.0mL  of methyl acetate for an experiment. By consulting the CRC…

A: Given data: Volume = 85.0 mL Density = 0.934 g cm-3

Q: A chemist prepares a solution of potassium iodide (KI) by measuring out 7.2x10^2 μmol of potassium…

A:

Q: m. How many times can you divide evenly a 893.4 cm long piece of copper wire until it is reduced to…

A: Given : The radius of copper atom = 1.3×10-10 To find : Number of evenly cuts or number of times.…

Q: A chemist adds 375.0 mL of a 0.012 mM iron(II) bromide (FeBr₂) solution to a reaction flask.…

A: Given, Concentration of iron(II) bromide (FeBr2) solution= 0.012 mM = 0.000012 M = 0.000012 mol/L…

Q: Analysis of a sample showed that it contained 68.3% lead, 10.6% sulfur, and 21.1% oxygen. What is…

A:

Q: How many neon atoms are contained in (6.89x10^2) grams of neon? Use at least two decimal places for…

A: Given -> Weight of neon = 6.89 × 102 gram

Q: e the chemist has added to the flask. Be sure your answe mg x10 X 3

A: Given,           Volume of Hg2Cl2 solution= 385.0 mL = 0.385 L            Concentration of Hg2Cl2…

Q: A manufacturer of paint claims that a gallon (3.78 L) of latex paint can cover 365 ft2 of the…

A: Volume of Paint = 3.78 L Surface Area of wall = 365 ft2 Thickness of painting = 3.40 mm   Volume of…

Q: A chemistry student needs 90.0g of carbon tetrachloride for an experiment. The density of carbon…

A:

Q: mol A chemist must prepare 650. ml. of 1.00 M aqueous-calcium bromide (CaBr) working solution.…

A: As we know,Moles the solute remains same on dilution but volume of the solution increases.Dilution…

Q: to make a tablet of aspirin, it requires 249 mg of salicylic acid. if the chemist purchased 9.0 x…

A: mass  of salicylic acid purchased by chemist = 9.0 x 10-3 OZ  Mass of salicylic acid required to…

Q: The radius of a copper (Cu) atom is roughly 1.3 × 10−10 m. How many times can you divide evenly a…

A: The radius is given as, 1.3 x 10-10 m. The diameter will be 2.6 x 10-10 m. Length of copper piece =…

Q: A jet airplane reaches 682. km/h on a certain flight. How long does it take to cover 342. m? Set the…

A: Given Speed (v) = 682 km/h Distance to be travelled (D) = 342 m = 342 × 10-3 km  Time taken (t)t = D…

Q: chemist prepares a solution of aluminum chloride AlCl3 by measuring out 32.μmol of aluminum…

A: Concentration is defined as total number of moles of solute present in 1000ml of solution.…

Q: Suppose you are trying to find the volume of a box based on the given measurements for the length,…

A: According to the rule for significant digits in addition and subtraction, the number of significant…

Q: A chemist must dilute 15.5 mL of 5.62 M aqueous sodium chloride (NaCl) solution until the…

A: Given, initial concentration of aqueous solution of NaCl =5.62 Minitial volume of solution =15.5…

Q: A chemist adds 350.0 mL of a 0.00132 g/L zinc oxalate (ZnC₂04) solution to a flask. Calculate the…

A: Given ,

Q: Express the following numbers as decimals:(a) 1.52 × 10−2 , (b) 7.78 × 10−8 , (c) 1 × 10−6, (d)…

A: Given numbers   Numbers Part(a) 1.52×10-2 Part(b) 7.78×10-8 Part(c) 1×10-6 Part(d)…

Q: mmol A chemist makes 460. mL of magnesium fluoride (MgF₂) working solution by adding distilled water…

A:

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.