Caffeine (M=194.2 g/mol) is a stimulant found in coffee, tea, soft drinks, and chocolate. Elemental analysis of caffeine shows 49.47 mass % C, 5.19 mass % H, 28.86 mass % N, and 16.48 mass % O. What is the molecular formula of caffeine?

Q: A sample of a substance with the empirical formula XCl3 weighs 0.5706 g. When it is dissolved in…

A: XCl3 + 3 AgNO3 -> 3AgCl + X(NO3)3 According to the above balanced equation 3 x number of moles of…

Q: 101. Copper(II) sulfide, CuS, is used in the development of aniline black dye in textile printing.…

A: The given chemical reaction can be written as,

Q: The Ostwald process is used commercially to produce nitric acid, which is, in turn, used in many…

A: Given,Mass of NH3 = 51. 8 gMass of O2 = 51. 8 gMoles of NH3 and O2 can be calculated as:

Q: Compound X contains the following composition by mass: 59.5% carbon, 10.5% hydrogen, and 30.0%…

A: The simplest formula of substance  that shows relative number of atoms present in the molecule of…

Q: Many fertilizers contain ammonium phosphate as a source of phosphorus and nitrogen. A 8.22 g sample…

A:

Q: A hydrate of formula M2EO3•XH2O (where M is a metal, E is a non-metal, and x is a whole number) has…

A: • Molar mass of oxygen = 16 g/mole                                     (0)• Formula weight of M2E…

Q: Calculate the empirical formula for a compound that is 60.87% C, 4.38% H, and 34.75% O by mass…

A: C : 60.87% H : 4.38%  O : 34.75%

Q: Sodium azide, an explosive chemical used in automobile airbags, is made by the following reaction:…

A: Given, mass of NaNO3 = 10.0 g mass of NaNH2 = 15.0 g percentage yield = 100%   To calculate : mass…

Q: 5.)  Calculate the mass in grams of 13.5 mol of A.) vinyl chloride C2H3Cl, the starting material…

A: One mole of any molecule corresponds to its moleculae weight. The moleculer weight corresponds to…

Q: Table salt, NaCl(s),NaCl(s), and sugar, C12H22O11(s),C12H22O11(s), are accidentally mixed. A 5.50…

A:

Q: 1. ASPARTAME, CHN,Os, is an artificial sweetener that is 160 times sweeter than sucrose (sugar or…

A:

Q: The Ostwald process is used commercially to produce nitric acid, which is, in turn, used in many…

A: To find mass of product formed.

Q: A) What is the molar mass of nickel (II) sulfate (NISO4) in grams per mole?  B) What is the amount…

A: Molar mass = Sum of the atomic mass of elements present in the compound  1 Mole = 6.023*1023 number…

Q: 1. What is the mass percent of C in C2O? 2. What is the mass percent of Ca in CaBr2? 3. What is…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: lodine is prepared both in the laboratory and commercially by adding Cl, (g) to an aqueous solution…

A: The balanced reaction taking place is given as, => 2 NaI (aq) + Cl2 (g) -------> I2 (s) + 2…

Q: Aluminum reacts with hydrochloric acid to produce aluminum chloride and hydrogen gas.         2…

A:

Q: A sample of limestone and other soil materials was heated, and the limestone decomposed to give…

A: Given: Weight of impure sample of limestone =4.138 g Weight of CO2 = 1.49 g We know that molar mass…

Q: A mass of 2.052 g of a metal carbonate, MCO3, is heated to give the metal oxide and 0.4576 g CO2.…

A: The reaction taking place is  MCO3 (s)  -----> MO(s) + CO2 (g) From the above balanced reaction,…

Q: Consider the following reaction: Al(OH)3 (s) + 3 HCl (aq) →AlCl3 (aq) + 3 H2O (l) a. What mass of…

A: First Calculate mole of Al(OH)3 by mass/molar mass  Then use mole mole relationship  1mol Al(OH)3…

Q: If 19.3 grams of an aqueous solution of ammonium nitrate, NH4NO3, contains 1.55 grams of ammonium…

A:

Q: The synthesis of maleic acid anhydride (C4H203) can be accomplished by reacting benzene (C6H6) and…

A: The given reaction  for production of maleic acid anhydride is…

Q: Aspirin, CsH4(0COCH3)CO2H, is produced by the reaction of salicylic acid, C6H4 (OH)CO2H, and acetic…

A:

Q: When a sample of acetic acid (vinegar) is burned, it can be determined that it has a mass percentage…

A: Given: Mass percentage of  Carbon =39.9%  Mass percentage of  Hydrogen =6.72%  Mass percentage of…

Q: A compound is 7.7% (by mass) hydrogen and 92.7 % carbon. It has a molecular weight of 52 g/mole.…

A: Empirical formula are the formula which represent simplest ratio of an element present in a given…

Q: One medication used to treat diabetic kidney disease, high blood pressure, and heart failure is made…

A:

Q: The molecular formula of acetylsalicylic acid (aspirin), one of the most commonly used pain…

A:

Q: In air, nitric oxide gas reacts with oxygen to produce nitrogen dioxide, which appears brown in…

A: The amount of Nitrogen dioxide formed can be calculated as follows

Q: A sample of limestone and other soil materials was heated, and the limestone decomposed to give…

A: We know that Molar mass of CO2=44g/mol Mass of CO2=2.14g Moles of CO2=MassMolar mass…

Q: Liquid nitromethane was once widely used as an explosive but is now much more common as a fuel for…

A:

Q: Iodine is prepared both in the laboratory and commercially by adding Cl, (g) to an aqueous solution…

A: From the given reaction,

Q: Solid red phosphorus reacts with liquid bromine to produce a phosphorus bromide.…

A: In this question, we want to determine the Empirical formula for PxBry and determination of…

Q: Iodine is prepared both in the laboratory and commercially by adding Cl₂ (g) to an aqueous solution…

A:

Q: Hematite, Fe₂O3, is an important ore of iron. (An ore is a natural substance from which the metal…

A:

Q: What mass of MnO2 is required to produce 48.4 g Cl2

A: Given :-  MnO2 (s)   +   4 HCl (aq)   →   MnCl2 (aq)   +   2 H2O (l)   +   Cl2 (g)  mass of Cl2 =…

Q: Phosphoric acid (H,PO,, MM = 98.00 g/mol) can be prepared by treating calcium phosphate (Ca (PO,),…

A:

Q: Iodine is prepared both in the laboratory and commercially by adding Cl2(g)Cl2(g) to an aqueous…

A: The balanced reaction is as follows: Molar mass of NaI = 149.89 g Molar mass of I2 = 253.81 g

Q: An organic compound contains only carbon, hydrogen, nitrogen, and oxygen. It is 61.71% C, 4.03% H,…

A:

Q: 1 Calculate the mass % of the limiting reactant BaCl2 in a salt mixture of mass 1.08 g, knowing that…

A: Given that, Mass of the salt mixture = 1.08 gms Mass of Ba3(PO4)2 ppt. = 0.231 gms Molar mass of…

Q: Industrially, nitric acid is produced by the Ostwald process represented by the following equations:…

A: Percent yield is defined as the percentage ratio of the actual yield to the theoretical multiplied…

Q: Isoeugenol is the compound which gives the characteristic odor to nutmeg and contains carbon,…

A:

Q: An impure sample of table salt (NaCl) that was dissolved in water and treated with silver nitrate to…

A: Mass of the impure sample = 1.741 g  Mass of AgCl formed = 4.084 g

Q: Iodine is prepared both in the laboratory and commercially by adding Cl2(g) to an aqueous solution…

A: Given, 82.1 g of iodine, I2

Q: If 1.00 g mixture of CaCl2 and Na,CO3 are put in a beaker and 100 mL of warm water is added and…

A: The number of moles of substance is calculated by the mass of given substance divided by the molar…

Q: What is the empirical formula for a compound that is 41.8% N, 24.7% C, 31.4% O, and 2.1% H by mass?…

A:

Q: A sample of limestone and other soil materials was heated, and the limestone decomposed to give…

A: CaCO3(s) --> CaO(s)+ CO2(g) Mass of lime stone containing sample = 3.043g CO2 produced = 1.25g

Q: A sample of a substance with the empirical formula XBr2 weighs 0.5000 g. When it is dissolved in…

A: Empirical formula of a compound simply represents the simplest ratio of atoms in a compound.…

Q: A mixture of butene, C4H8, and butane, C4H10, is burned in air to give CO2 and water. Suppose you…

A:

Q: Calculate the number of grams in: (b) 0.84 mol of 2-propanol, C3H8O (rubbing alcohol). (d)  0.348…

A:

Q: A sample of limestone and other soil materials was heated, and the limestone decomposed to give…

A: The decomposition reaction of CaCO3 can be written as, => CaCO3 (s) ---------> CaO (s) + CO2…

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.