HELP on stoichiometry?
The first thing to look at with this problem is the ration of sodium phosphate (Na3PO4) and NaOH. It takes 3 mol of NaOH to make 1 mol of Na3PO4 and rhis comes right from the balanced eaquation. So for this problem there is 0.24 mol of NaOH and with a ratio of 3:1, you can set up the relationship: 3 mol NaOH/1 mol Na3PO4 = 0.24 mol NaOH/ x mol Na3PO4 solve this for x to get 0.08 mol Na3PO4
Please help on my Chemistry Stoichiometry exercises!!! I cant figure out how to do this, I am loss :(?
You have the balanced equation: 6KI + 8HNO3 → 6KNO3 + 2NO + 3I2 + 4H20 What does this tell you : 6mol KI will react with 8 mol HNO3 to produce 6 mol KNO3 + 2 mol NO + 3 mol I2 + 4 mol H2O a) Molar mass KI = 166.0g/mol mol KI in 38g = 38/166 = 0.229 mol KI From the equation this will produce 0.229*3/6 = 0.1145 mol I2 Molar mass I2 = 126.9*2 = 253.8 g/mol mass of 0.1145 mol I2 = 0.1145*253.8 = 29 g I2 produced ( 2 sig figs) b) Molar mass HNO3 = 63.0g/mol moles in 47.0g HNO3 = 47.0/63.0 = 0.746 mol HNO3 From the equation this will produce 0.746* 2/8 = 0.187 mol NO At STP 1 mol NO has volume = 22.4L 0.187 mol NO has volume = 0.187*22.4 = 4.19L NO produced ( 3 sig figs) c) 1mol KI will react with 8/6 = 1.33 mol HNO3 1000mL of 6.00M HNO3 solution contains 6.00 mol HNO3 Volume that contains 1.33 mol HNO3 = 1.33/6.00*1000 = 222 mL HNO3 solution d) When you produce 2 mol NO you produce 3 mol I2 When you produce 8 mol NO you must produce 12 mol I2 1 mol I2 contains 6.022*10^23 molecules I2 12 mol I2 contain 12*6.022*10^23 = 7.2*10^24 molecules of I2 e) Mol KI in 35.0mL of 0.250M solution = 35.0/1000*0.250 = 0.00875 mol KI This will produce 0.00875*3/6 = 0.004375 mol I2 molar mass I2 = 253.8 g/mol Mass of 0.004375 mol I2 = 0.004375*253.8 = 1.11g I2 produced.
Stoichiometry help? TNT?
Trinitrotoluene (TNT) is manufactured by reaction of toluene with nitric acid. C7H8+3HNO3 -> C7H5N3O6+ 3H2O How many moles of C7H5N3O6 are produced? A. 1.85 x 10^24 mol B. 100 mol C. 3.00 mol D. 2.01 x 10^-22 mol E. 2.25 mol F. 1.00 mol G. 225 mol H. 33.3 mol
Stoichiometry help please...........................
an alloy used in aircraft structures consists of 93.7% Al & 6.3% Cu by mass.the alloy has a density of 2.85g/cm3.a 0.691cm3 piece of the alloy reacts with an excess of HCl.if we assume that all of the Al but none of the Cu reacts with HCl,what is the mass of H2 obtained?
Gas Laws and Stoichiometry - help needed!!!?
Can someone help me to make this exercise? 1) If the density of N2 gas in a flask is 0.243 g/L at 18 °C, what is the pressure of nitrogen in the flask if it is heated to 36 °C? (R = 0.08206 L atm mol–1K–1) 1. 0.207 atm 2. 0.220 atm 3. 0.258 atm 4. 0.414 atm 5. 0.486 atm 2) Gas Laws and Stoichiometry Ammonium sulfate, an important fertilizer, can be prepared by the reaction of ammonia with sulfuric acid: 2 NH3(g) + H2SO4 → (NH4)2SO4 Calculate the volume of NH3 in dm3 (L) needed at 10.6°C and 1.112 atm to react with 124 kg of H2SO4.
Chemistry Exercise Redox equation 1/2 reaction + Stoichiometry?
2 MnO4- + 5 C2O42- + 16 H+ =2 Mn2+ + 10 CO2 + 8 H2O moles MnO4- = 0.0258 L x 2.185 x 10^-2 M=0.0005637 moles C2O42- = 0.0005637 x 5/2=0.001409 moles C2O42- in 1 L (= 1000 mL) = 0.001409 x 1000 / 5.55 =0.254 mass Na2C2O4 = 0.254 mol x 134 g/mol=34.0 g
What is a tip to studying stoichiometry?
Hello dear…Tips are..Learn all the concepts and formula by heart.. then go for SOLVING problems, this will strengthen ur concept and make u confident. Solve NCERT all examples, intext and exercise and then for JEEu should solve M S CHAUHAN. In this solve level 1, this will strengthen ur concept and then solve level 2 and 3, this will enhance ur concept and make u confident.. and finally go for ur previous years questions paper..For boards, NCERT is sufficient but if u want to solve more then go for ABC book of chemistry. And surely solve previous years questions paper..All the very best…!!!!
Does all the questions come from ncert exercises in chemistry 12 boards?
Almost all the questions in CBSE Board examinations come from NCERT textbooks. But this does not mean that the questions will come only from NCERT exercises. This is applicable to all the subjects and not just chemistry. The questions are designed so as to test your knowledge of various concepts and hence are not the exact copy of exercise-questions. You will be able to answer them only when you go through and understand all the chapters in the book. Since NCERT books are concise, sometimes certain reference books can also be helpful. You should solve practice papers to get an idea about the type of questions asked in the examination. You can get accurate information about the subject-specific study materials and previous years’ papers instantly at https://www.toppr.com/boards/cbse/. If you are clear with your basics, it would help you in the long run (for entrance exams). I am giving the list of books for chemistry some of which you can refer to for your Board exams:· NCERT Textbook (is a must)· NCERT Solutions by Arihant· Pradeep’s New Course Chemistry· Modern’s ABC for ChemistryAlso understand the fact that only getting marks is not important; always study with the motive that you want to understand the topic and then you would realize that only doing the exercises is not enough.Hope this helps. All the Best!
How should one prepare for stoichiometry for the JEE Advanced?
Thanks for A2AWell Stoichiometry is one of the most important and fundamental topics of physical chemistry. Its more or less like trigonometry in Maths wherein direct questions from these topics are less common but their concepts and formulas are used in almost every question you will solve in JEE Paper. So its a necessity for any JEE aspirant to cover stoichiometry well and learn to apply various laws in theoretical as well as numerical problems .As i always say your first priority should be understanding your classnotes well and you should be able to solve all the class illustrations by yourself at home after completion of the topic in class. if you face any problem in your class notes immediately contact your teacher and get your doubts rectified . After that you should solve your coaching material and the practice sheets that your teacher provided in class . This will probably ensure that you will be able to solve almost all questions related to stoichiometry at JEE level atleast. After that i will suggest you to go for RC Mukherjee. It’s the best book for covering stoichiometry and strengthening your concepts.Stoichiometry is divided into 6–7 chapters and therefore if you do RC Mukherjee i don’t think there will be a problem that you cannot solve from stoichiometry. I Will advice you to do atleast all the solved examples from RC Mukherjee because probably you won’t get time to do the unsolved exercises too . You may do it in the end during the time of revision .Other than that do learn how to balance various kinds of Redox reactions (there is a whole chapter in RC Mukherjee dedicated to balancing of redox reactions) and most importantly learn to apply the law of equivalence .It is the most important law in Physical chemistry in my opinion . Learn to calculate n-factor for various kinds of cases/ compounds and do try previous year JEE Problems from stoichiometry.IIT’s had asked some brilliant problems related to volumetric titrations when JEE Was subjective. Make sure that you do them allAll the Best!