Concept explainers
Interpretation: The mass percentage of aluminum in the alloy should be found out if 0.3284 g of
Concept introduction:
Iron- aluminum alloys possess a property of getting magnetized in the presence of a magnetic field and to get demagnetized in its absence.
When metals above Hydrogen in the reactivity series are reacted with hydrochloric acid, it will result in the metal chloride with bubbles of hydrogen gas.
Answer to Problem 4.92PAE
Solution:
Percentage of aluminum in alloy = 12.6 %
.
Explanation of Solution
Given information:
Total mass of Alloy = 7.264 g
Total mass of
Aluminum and iron react with HCl as shown below.
Assuming that,
Mass of Aluminum = m g
Mass of Iron = 7.264 - m g
Stoichiometry of,
Al: H2 = 1: 3/2
Fe: H2 = 1: 1
Because of excess HCl, it is assumed that total alloy reacted.
Therefore,
According to given data,
Evolved H2(g) moles = 0.3284 g / 2 gmol-1
Stoichiometric
Mass percentage of a metal in an alloy can be found out when the total mass of alloy and the mass of hydrogen gas released out when the alloy is reacted with hydrochloric acid is known.
Want to see more full solutions like this?
Chapter 4 Solutions
Chemistry for Engineering Students
- Archimedes tells us the lifting power of a balloon (how much mass it can lift) is equal to the difference between the mass of the balloon and the mass of the air it displaces. That is, if the balloon occupies the same volume as 10 kg of air, but the balloon only weighs 2 kg, then the balloon can lift 8 kg. Airships have sometimes been filled with hydrogen (H₂), but hydrogen is very flammable, and after the Hindenburg caught fire and crashed in 1937 with serious loss of life airships have nearly always been filled with helium (He) instead. Passengers with H₂: Passengers with He: gas 0 H₂ He air density 0.090 0.18 1.23 kg 3 m kg 3 m kg Suppose a new airship Star of Balogna will have the shape of a cylinder 100. m long, with a radius of 15.0 m, and will weigh 9250. kg without any gas inside it. Suppose also the average passenger weighs 82 kg. Calculate how many passengers the Balogna could carry if it were filled with hydrogen, and also if it were filled with helium. marrow_forwardConsider the reaction: CH 4( g) + 2O 2( g) → CO 2( g) + 2H 2O( g) Which of the following statements is correct? Oxygen is the reducing agent. The reaction is not an oxidation-reduction reaction. Oxygen is oxidized. Carbon is oxidized. Carbon is the oxidizing agent.arrow_forward(A) if both sentences are true,(B) if both sentences are false,(C) if the first sentence is true but the second is false, and(D) if the first sentence is false but the second is true. 1. In a redox reaction, the oxidation number of iron changed from +2 to +3; thus, sulfur is a reducing agent. In a redox reaction, the oxidation number of nitrogen was unchanged; thus, nitrogen is an oxidant. 2. In a redox reaction, the reducing agent is oxidized and it gains electrons. In a redox reaction, the oxidizing agent is reduced and it gains electrons. 3. Bending stress is also known as flexural stress. The test used in observing the mechanical strength of chocolate is the three-point bend test. 4. The flexural strength of materials may be expressed in Pascals. Magnesium is more reactive than silver; therefore, magnesium corrodes faster than silver with the aid of air, oxygen, and sea water.arrow_forward
- Consider the nickel salt: (NH4 )2Ni(SO4 )2 ·y H2O (Ammonium Nickel Sulfate Hydrate), where y is the number of coordinated waters. The actual yield of product was 9.640 g - obviously containing coordinated water. The product was then heated strongly until all the water had been driven off. The resulting anhydrous salt had mass 7.000 g. What is the value of y?arrow_forwardThe fluoride rinse in dental offices usually contains sodium fluoride. Sodium fluoride can be prepared from the reaction between sodium metal and fluorine gas. Which properly represents the balanced chemical equation for this reaction? Please explain the steps. Na(s) + F2(g) → NaF2(s) Na(s) + F(g) → NaF(s) 7Na(s) + F(g) → Na7F(s) 2Na(s) + F2(g) → 2Na2F(s) 2Na(s) + F2(g) → 2NaF(s) Why is it important to understand this equation? What do you think could happen if this is incorrect?arrow_forwardIn an experiment to study the reactivity of Ru(s), TI(s), Gd(s) and V(s), a student observed the reactions. Tl(s) + Ru³+ (aq) → Ru(s) + T1³+ (aq) Tl(s) + Gd³+ (aq) → no evidence of a reaction Ru(s) + V³+ (aq) → V(s) + Ru³+ (aq) 1. Ru(s) 2. Tl(s) 3. Gd(s) 4. V(s) When the oxidizing agents are listed from strongest to weakest the order would be 5. Tl³+ (aq) 6. Ru³+ (aq) 7. Gd³+ (aq) 8. V³+ (aq) When the reducing agents are listed from strongest to weakest the order would be Another spontaneous reaction that would occur is Select one: O Gd(s) + Ru³+ (aq) → Ru(s) + Gd³+ (aq) Ru(s) + T1³+ (aq) → Tl(s) + Ru3³+ (aq) O V(s) + Gd³+ (aq) → Gd(s) + V³+ (aq) O V(s) + T1³+ (aq) - Tl(s) + V³+ (aq) + ◆ +arrow_forward
- Hematite, Fe₂O3, is an important ore of iron. (An ore is a natural substance from which the metal can be profitably obtained.) The free metal is obtained by reacting hematite with carbon monoxide, CO, in a blast furnace. Carbon monoxide is formed in the furnace by partial combustion of carbon. The reaction is Fe₂O3(s) + 3CO(g) → 2Fe(s) + 3CO₂(g) How many grams of iron can be produced from 1.34 kg Fe₂03? g Fearrow_forwardActivated LicI Nacl KCI CaCl, SrCl, charcoal* "Burning Bunsen_burner.jpg" by Connor Lee is licensed under CC BY-SA 3.0arrow_forwardMg(OH)2(s)+2HNO3(aq)→ the balanced chemical formula?arrow_forward
- b The Ostwald process for the commercial production of nitric acid from ammonia and oxygen involves the following steps: 4NH3(g) + 502(g) → 4NO(g) + 6H,O(g) (1) 2NO(g) + O2(g) → 2NO2(g) (2) 3NO2(g) + H20(1) → 2HNO3(aq) + NO(g) (3) Is the overall reaction exothermic or endothermic? exothermic endothermicarrow_forwardThe fluoride rinse in dental offices usually contains sodium fluoride. Sodium fluoride can be prepared from the reaction between sodium metal and fluorine gas. Which properly represents the balanced chemical equation for this reaction? Na(s) + F2(g) → NaF2(s) Na(s) + F(g) → NaF(s) 7Na(s) + F(g) → Na7F(s) 2Na(s) + F2(g) → 2Na2F(s) 2Na(s) + F2(g) → 2NaF(s) Why is it important to understand this equation? What do you think could happen if this is incorrect? ***************************************************************************** Need help with this portion For balancing equations my approach is trial by error. We want to sum up the atoms on each side and change the coefficients (number in front of each chemical species) until they are equal. I find the easiest way is to play with the numbers until they add up, and with practice you will see some patterns emerge. There is also this method below recommend by the book. However you choose to approach it is up to you, everyone has their…arrow_forwardThe fluoride rinse in dental offices usually contains sodium fluoride. Sodium fluoride can be prepared from the reaction between sodium metal and fluorine gas. Which properly represents the balanced chemical equation for this reaction? Na(s) + F2(g) → NaF2(s) Na(s) + F(g) → NaF(s) 7Na(s) + F(g) → Na7F(s) 2Na(s) + F2(g) → 2Na2F(s) 2Na(s) + F2(g) → 2NaF(s) Why is it important to understand this equation? What do you think could happen if this is incorrect? Thank youarrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage LearningGeneral Chemistry - Standalone book (MindTap Cour...ChemistryISBN:9781305580343Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; DarrellPublisher:Cengage Learning