The writer is very fast, professional and responded to the review request fast also. Thank you.
Presentation/PPT
27/08/2022
Written Assignment 4: Chemical Reactions
Answer all assigned questions and problems, and show all work.
1. Write the (a) balanced equation for the formation of liquid water from hydrogen and oxygen gas, and use it to explain the following terms: (b) chemical reaction, (c) reactant, (d) product. (12 points)
2. Balance the following equations: (18 points)
3. Calculate the mass in grams of iodine (I2) that will react completely with 20.4 g of aluminum (Al) to form aluminum iodide (AlI3). (5 points)
(Reference: Chang 3.47)
4. The annual production of sulfur dioxide from burning coal and fossil fuels, auto exhaust, and other sources is about 26 million tons. The equation for the reaction is
S(s) + O2 (g) → SO2 (g)
How much sulfur (in tons), present in the original materials, would result in that quantity of SO2? (5 points)
(Reference: Chang 3.69)
5. Each copper (II) sulfate unit is associated with five water molecules in crystalline copper(II) sulfate pentahydrate (CuSO4 ⋅ 5H2O). When this compound is heated in air above 100oC, it loses the water molecules are also its blue color:
CuSO4 ⋅ 5H2O → CuSO4 + 5H2O
If 9.60 g of CuSO4 are left after heating 15.01 g of the blue compound, calculate the number of moles of water originally present in the compound. (5 points)
(Reference: Chang 3.73)
6. The fertilizer ammonium sulfate [(NH4)2SO4] is prepared by the reaction between ammonia (NH3) and sulfuric acid:
2 NH3(g) + H2SO4(aq) → (NH4)2SO4(aq)
How many kilograms of NH3 are needed to produce 1.00 × 105 kg of (NH4)2SO4?
(5 points)
(Reference: Chang 3.77
7. Nitric acid (NO) reacts with oxygen gas to form nitrogen dioxide (NO2), a dark brown gas:
2NO(g) + O2(g) → 2NO2(g)
In one experiment 0.886 mole of NO is mixed with 0.503 mol of O2.
(Reference: Chang 3.83)
8. Propane (C3H8) is a component of natural gas and is used in domestic cooking and heating. It burns according to the following reaction:
C3H8 + 5O2 → 3CO2 + 4H2O
9. Hydrogen fluoride is used in the manufacture of Freons (which destroy ozone in the stratosphere) and in the production of aluminum metal. It is prepared by the reaction
CaF2 + H2SO4 → CaSO4 + 2HF
In one process 6.00 kg of CaF2 are treated with an excess of H2SO4 and yield 2.86 kg of HF. Calculate the percent yield of HF. (5 points)
(Reference: Chang 3.89)
10. Certain race cars use methanol (CH3OH; also called wood alcohol) as a fuel. Methanol has a molecular mass of 32.0 g/mol and a density of 0.79 g/mL. The combustion of methanol occurs according to the following equation:
2CH3OH + 3O2 → 2CO2 + 4H2O
In a particular reaction 2.00 L of methanol are reacted with 80.0 kg of oxygen.
11. An iron bar weighed 664 g. After the bar had been standing in moist air for a month, exactly one-eighth of the iron turned to rust (Fe2O3). Calculate the final mass of the iron bar and rust. (5 points)
(Reference: Chang 3.111)
The writer is very fast, professional and responded to the review request fast also. Thank you.
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.
Read moreEach paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.
Read moreThanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.
Read moreYour email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.
Read moreBy sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.
Read more