On the fictional planet of Nofactori, two commonly used mass units are related to one another by the following exact conversion: 1 grut = 11 bligs How would scientists on Earth, using SI prefixes, express 269 hectogruts in terms of decibligs? A) 2.96 × 10² B) 3.25 x 10¹6 C) 2.45 x 10° D) 2.96 x 10 E) 2.45 x 107

On the fictional planet of Nofactori, two commonly used mass units are related to one another by the following exact conversion: 1 grut = 11 bligs How would scientists on Earth, using SI prefixes, express 269 hectogruts in terms of decibligs? A) 2.96 × 10² B) 3.25 x 10¹6 C) 2.45 x 10° D) 2.96 x 10 E) 2.45 x 107

Chemistry In Focus

7th Edition

ISBN:9781337399692

Author:Tro, Nivaldo J.

Publisher:Tro, Nivaldo J.

Chapter1: Molecular Reasons

Section: Chapter Questions

Problem 38E: Several samples of methane gas, the primary component of natural gas, are decomposed into carbon and...

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A materials engineer has filed for a patent for a new alloy to be used in golf club heads. The composition by mass ranges from 25 to 31% manganese, 6.3 to 7.8% aluminum, 0.65 to 0.85% carbon, and 5.5 to 9.0% chromium, with the remainder being iron. What are the maximum and minimum percentages of iron possible in this alloy? Use Figure 2.12 to snake a prediction about how the density of this alloy would compare with that of iron; justify your prediction.
3.37 If atypical grain of sand occupies a volume of 1.3 × 10-4 cm3, what is the volume (in cm3) of 1 mole of sand (ignoring the space between grains)? What is the volume in liters?
On October 21, 1982, the Bureau of the Mint changed the composition of pennies (see Exercise 120). Instead of an alloy of 95% Cu and 5% Zn by mass, a core of 99.2% Zn and 0.8% Cu with a thin shell of copper was adopted. The overall composition of the new penny was 97.6% Zn and 2.4% Cu by mass. Does this account for the difference in mass among die pennies in Exercise 120? Assume the volume of the individual metals that make up each penny can be added together to give the overall volume of the penny, and assume each penny is the same size. (Density of Cu = 8.96 g/cm3; density of Zn = 7.14 g/cm3).
What is the chief factor that determines thephysical slateof a sample of matter?
You take three compounds, each consisting of two elements (X, Y. and/or Z), and decompose them to their respective elements. To determine the relative masses of X, Y. and Z. you collect and weigh the elements, obtaining the following data: Elements in Compound Masses of Elements 1. X and Y X = 0.4 g, Y = 4.2 g 2. Y and Z Y = 1.4 g, Z = 1.0 g 3. X and Y X = 2.0 g, Y = 7.0 g a. What are the assumptions needed to solve this problem? b. What are the relative masses of X, Y. and Z? c. What are the chemical formulas of the three compounds? d. If you decompose 21 g of compound XY, how much of each element is present?
Consider two boxes with the following contents: the first contains 30 bolts and 30 nuts that fit the bolts; the second contains the same number of nuts and bolts with the difference that each bolt has the nut screwed on it. Which box has contents that would be an analogy for a mixture, and which box has contents that would be an analogy for a compound?
Several samples of methane gas, the primary component of natural gas, are decomposed into carbon and hydrogen. The masses of the carbon and hydrogen are then weighed, and the results are tabulated as shown here. Which of these does not follow the law of constant composition? a. 4.0 grams hydrogen and 12.0 grams carbon b. 1.5 grams hydrogen and 4.5 grams carbon c. 7.0 grams hydrogen and 17.0 grams carbon d. 10 grams hydrogen and 30 grams carbon
A 15.5 g sample of sodium carbonate is added to a solution of acetic acid weighing 19.7 g. The two substances react, releasing carbon dioxide gas to the atmosphere. After reaction, the contents of the reaction vessel weigh 28.7 g. What is the mass of carbon dioxide given off during the reaction?
The seven most abundant ions in seawater make up morethan 99% by mass of the dissolved compounds. They are listedin units of mg ion/kg seawater: chloride 18,980; sodium 10,560;sulfate 2650; magnesium 1270; calcium 400; potassium 380;hydrogen carbonate 140.(a) What is the mass % of each ion in seawater?(b) What percent of the total mass of ions is sodium ion?(c) How does the total mass % of alkaline earth metal ions com-pare with the total mass % of alkali metal ions?(d) Which makes up the larger mass fraction of dissolved com-ponents, anions or cations?
(a) Palladium (Pd) is an element with properties similar to those of platinum. It is useful in eliminating harmful emission produce by internal combustion engines. Two students were given identical cylindrical “palladium” bars with the following data: Mass = 96.03 g; Length = 10.7 cm; Diameter = 9.82 mm; Density = 12.02 gcm-3 Show the calculations that Student K and S would do if: Student K was asked to determine whether his bar was made of pure palladium. Student S was asked to calculate the grams of ethyl alcohol (d = 0.789 gcm-3) his bar would displace.
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?
It has been estimated that there is 4.00 × 10-4 mg of gold per liter of seawater. At price of $19.40/g, what would be the value of the gold in 7.41 km3 (1 km3 = 1 × 1015 cm3) of the ocean?