A student measures the dimensions of a metal block to be 2.0 cm in length, 1.0 cm in width, and 0.75 cm in thickness. He/she also determines its mass to be 7.56 g. 3. a. Calculate the density of the metal. g/cm3 b. What is the percent error in the student's result, if the correct density of the metal is 4.8 g/cm3?

A student measures the dimensions of a metal block to be 2.0 cm in length, 1.0 cm in width, and 0.75 cm in thickness. He/she also determines its mass to be 7.56 g. 3. a. Calculate the density of the metal. g/cm3 b. What is the percent error in the student's result, if the correct density of the metal is 4.8 g/cm3?

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter1: Introduction To Chemistry

Section: Chapter Questions

Problem 1.87PAE: 1.87 A solution of ethanol in water has a volume of 54.2 mL and a mass of 49.6 g. what information...

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1.87 A solution of ethanol in water has a volume of 54.2 mL and a mass of 49.6 g. what information would you need to look up and how would you determine the percentage of ethanol in this solution?
Gold leaf, which is used for many decorative purposes, is made by hammering pure gold into very thin sheets. Assuming that a sheet of gold leaf is 1.27 105 cm thick, how many square feet of gold leaf could be obtained from 28.35 g gold? The density of gold is 19.3 g/cm3.
A 124-g sample of a pure liquid, liquid A, with a density of 3.00 g/mL is mixed with a 40.8-mL sample of a pure liquid, liquid B, with a density of 2.00 g/mL. What is the total volume of the mixture? (Assume there is no reaction upon the mixing of A and B, and volumes are additive.)
The estimated amount of recoverable oil from the field at Prudhoc Bay in Alaska is 1.3 1010 barrels. What is this amount of oil in cubic meters? One barrel = 42 gal (exact), 1 gal = 4 qt (exact), and 1 qt = 9.46 104 m3.
. A sample of an ethanol-water solution has a volume of 52.5 cm³ and a mass of 49.6 g. What is the percentage of ethanol (by mass) in the solution? (Assume that there is no change in volume when the pure compounds are mixed.) The density of ethanol is 0.789 g/cm³ and that of water is 0.998 g/cm³. Percentage of ethanol = b. Alcoholic beverages are rated in proof, which is a measure of the relative amount of ethanol in the beverage. Pure ethanol is exactly 200 proof, a solution that is 50% ethanol by volume is exactly 100 proof. What is the proof of the given ethanol-water solution? proof Submit Answer % [References] Try Another Version 10 item attempts remaining
3. Carbon monoxide is a common pollutant in urban environments.On one particular day, the air contains 5.5 mg of carbon monoxide per 1.000 cubic meter of air. How many grams of carbon monoxide are present in a room whose dimensions are 12 feet x 9.5 feet x 10.5 feet?
4. The density of a proton is approximately 4.0 x 1014 g/cm°. If the mass of the proton is 1.7 x 1024 g, calculate its volume. 4 b. Using the volume of a sphere equation, determine the radius of the proton in centimeters (cm). The volume of a sphere: V = Tr. (T= 3.14159) 4 c. Convert this answer to nanometers (nm).
An aluminum cylinder is 0.512 ft in length and has a diameter of 0.3142 inch. The density of aluminum is 2.70 g / cc. MW of aluminum is 26.981538. What is the volume of the aluminum cylinder in cm3? What is the mass of the aluminum cylinder in g? Calculate the number of aluminum atoms present in the cylinder?
3. When a piece of metal weighing 108 g is submerged in water the volume changes from 36.9 mL to 49.2 mL. Calculate the density of this metal. 4. The accepted value for the density of a certain metal is 6.81 g/cm³ . Calculate the percent error in a laboratory measurement that gives a density value of 6.6 g/cm³ . Express this result in the proper number of significant figures.
6. Eggs shipped from a poultry farm in trucks. Each carton of eggs holds 12 eggs. The cartons of eggs are then placed in a crate that holds 20 cartons. The cartons are packed in trucks that carry 3125 crates of eggs. How many truckloads will it take to carry 3.75 x 106 eggs?
A chemist prepares a solution of calcium sulfate (CaSO) by weighing out 0.293 g of calcium sulfate into a 400. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in g/L of the chemist's calcium sulfate solution. Be sure your answer has the correct number of significant digits. g x10 ?
A chemist must dilute 85.6 mL of 119. mM aqueous potassium permanganate (KMnO4) solution until the concentration falls to 7.00 mM. He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in liters. Round your answer to 3 significant digits. OL 0 x S

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