Methanol (CH3OH) is a liquid at room temperature with a density of 7.91 x102 kg/m³. In a certain experiment, from the reaction of 2.91 mL of methanol with 2.88 g of oxygen, 2.27 g of carbon dioxide was obtained. (а) (b) What type(s) of chemical reaction is (are) occurring in this experiment? What equipment do you think was used to measure the volume of methanol in this experiment? Calculate the percent yield of the carbon dioxide in this experiment. (c)

Methanol (CH3OH) is a liquid at room temperature with a density of 7.91 x102 kg/m³. In a certain experiment, from the reaction of 2.91 mL of methanol with 2.88 g of oxygen, 2.27 g of carbon dioxide was obtained. (а) (b) What type(s) of chemical reaction is (are) occurring in this experiment? What equipment do you think was used to measure the volume of methanol in this experiment? Calculate the percent yield of the carbon dioxide in this experiment. (c)

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter3: Molecules, Moles, And Chemical Equations

Section: Chapter Questions

Problem 3.83PAE: 3.83 For the reaction of nitrogen, N2, and hydrogen, H2, to form ammonia, NH3, a student is...

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Assume that the radius of Earth is 6400 km, the crust is 50. km thick, the density of the crust is 3.5 g/cm3, and 25.7% of the crust is silicon by mass. Calculate the total mass of silicon in the crust of Earth.
3.83 For the reaction of nitrogen, N2, and hydrogen, H2, to form ammonia, NH3, a student is attempting to draw a particulate diagram, as shown below. Did the student draw a correct representation of the reaction? If not, what was the error the student made?
A soft drink contains an unknown mass of citric acid, C3H5O(COOH)3. It requires 6.42 mL of 9.580 × 10−2-M NaOH to neutralize the citric acid in 10.0 mL of the soft drink. C3H5O(COOH)3(aq) + 3 NaOH(aq) → Na3C3H5O(COO)3(aq) + 3 H2O(ℓ) Determine which step in these calculations for the mass of citric acid in 1 mL soft drink is incorrect? Why? n (NaOH) = (6.42 mL)(1L/1000 mL)(9.580 × 10−2 mol/L) n (citric acid) = (6.15 × 10−4 mol NaOH) × (3 mol citric acid/1 mol NaOH) m (citric acid in sample) = (1.85 × 10−3 mol citric acid) × (192.12 g/mol citric acid) m (citric acid in 1 mL soft drink) = (0.354 g citric acid)/(10 mL soft drink) Determine the correct result.
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).
A saline solution used in intravenous drips for patients who cannot take oral fluids contains 0.92 (w/v) NaCl in water. What volume of the saline solution must be administered to the patient in order to deliver 7.7 g of NaCl?
It has been estimated that there is 4 x 10^-4 mg of gold per liter of seawater. At a price of $19.40/g, what would be the value of the gold in 1 km^3 (1 x 10^25 cm^3) of the ocean?
It is recommended that drinking water contain 1.6ppm fluoride (F-) for the prevention of tooth decay. Consider a reservoir with a diameter of 4.50 x 102 m and a depth of 10.0 m. (The volume is πr2h, where r is the radius and h is the height.) How many grams of F- should be added to give 1.6ppm? How many grams of sodium fluoride, NaF, contains this much fluoride?
A sample of an ethanol-water solution has a volume of 54.4 cm^3 and a mass of 49.9 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/cm^3 and that of water is 0.998 g/cm^3.
One of the reactions in the Solvay Process involves the reaction of calcium oxide with water toproduce slaked lime (calcium hydroxide).CaO(s) + H O2 (l) - Ca(OH)2 (s)A lab technician performs the experiment and uses 54.8 g of calcium oxide to react with a setamount of water. When the reaction is completed, the technician uses a filtration apparatus tocollect the mass of calcium hydroxide produced. The following data is recorded:Mass of filter paper: 1.24 gMass of filter paper and solid: 68.04 g What is the theoretical mass of calcium hydroxide that is predicted to be produced? What mass of precipitate was collected in this experiment? What is the percent error? Comment on the validity of the results
One of the sources of iron is magnetite, Fe3O4 (FeO and Fe2O3 mixed), which reacts with coke (carbon) to produce iron in the liquid state and carbon monoxide. If we assume that coke is pure carbon, how much is supplied to produce 10,000 metric tons of iron?
An alcoholic fermentation was conducted in the laboratory using 280 g glucose as substrate with a working volume of 2,000 mL. Assuming that the sugar is completely fermented to ethanol. Calculate the volume of ethyl alcohol in liters produced. The density of ethyl alcohol is 0.79 g/mL and its concentration or percent ethyl alcohol by volume produced assuming that no volume changed during fermentation.
The sugar content of a wine is determined five times, and the following results obtained: 150, 155, 155, 152 en 144 g/L. Determine with 90% confidence if the 5th value (144 g/L) must be excluded (outlier) or included (not outlier) in further calculations

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