Why should a pure compound have a definite composition by weight? how is it possible for two samples of a given compound, NaCl, for example to have different compositions by weight

Q: Phellandrene is a component of frankincense resin and has an odor described as “peppery-minty”. It…

A: Given ; hydrogen = 11.84%

Q: A compound is found to contain 15.94 % boron and 84.06 % fluorine by mass. What is the empirical…

A:

Q: 1. Use chemical symbols to generate the factor needed to convert the weight of the substance in uie…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: What mass of SbF3 (179g x mol^-1) is needed to produce 1.00 g of Freon-12, CCl2F2 (molar mass =121 g…

A: We have chemical balanced equation of Freon-12 from SbF3 . We have to calculate the amount of SbF3…

Q: To determine the amount of platinum in an alloy, a 8.565 g8.565 g sample of an alloy containing…

A:

Q: What gravimetric factor is required to calculate the weight of sulfur trioxide, SO3 (MM = 80.064…

A: We have to tell What gravimetric factor is required to calculate the weight of sulfur trioxide

Q: Three elements, A, Q, and Z, have the molar masses indicated in the table below. Given a compound…

A: empirical formula has to be determined using the given data

Q: A crucible is placed on a balance and is found to have a mass of 26.639 grams a sample of…

A: Mass of crucible = 26.639 g Mass of crucible + mass of Na2SO4·xH2O = 27.085 g Therefore mass of…

Q: Galantamine is a drug given to patients who have Alzheimer's disease. Its chemical formula is…

A:

Q: A) Chlorophyll molecules are responsible for the green pigmentation of plants. Differing chemically…

A: Given that : 1 molecule of chlorophyll X contains 4 N atoms. % nitrogen by weight = 6.26 %

Q: A compound contains 24.3% C, 4.1% H, and 71.6% Cl by mass, and has a molar mass of 99 g/mol. What is…

A:

Q: If you have a total of 5.2 grams of a mixture and 2.0 grams of that mixture is determined to be…

A:

Q: Explain what the subscript in the formula for a compound indicates. Explain what the coefficient in…

A: Since you have posted multiple short questions, as per our company guidelines we are supposed to…

Q: Describe how molecular formulas and structural formulas areused to represent the compositions of…

A: Molecular formulas and structural formulas are used to represent the compositions of molecules that…

Q: An experiment is designed to determine the mass percent of sulfate in an unknown soluble sulfate…

A: In this question, we have to find out the correct answer of given problem by the help of the…

Q: 1.    How many grams are in 7.3 x 1024 formula units of Mn?  Mn= 54.94   Molar Mass:       =…

A: Given that -  Number of formula units in Mn = 7.3×1024  And, molar mass of Mn = 54.94 g/mol…

Q: A crucible is placed on a balance and is found to have a mass of 26.639 grams a sample of…

A: Since on heating the compound, the mass of water will be lost as it will get vaporised  Hence the…

Q: CH4 (g) + 202 (g) C02 (g) + 2H20(g) Suppose 8.00 g of CH4 is allowed to burn in the presence of…

A: Given information: 8.00 g of CH4  16.00 g of oxygen The reaction is given as follows: CH4 (g) +…

Q: A compound is 54.53% carbon, 9.15% hydrogen, and 36.32% oxygen by mass. What is its empirical…

A: This question belongs to Mole concept. we have used formula  Mass % of an element = Mass of that…

Q: What is the difference between molar mass of a compound and empirical formula mass of a compound?…

A:

Q: osmium by mass. a) If you assume 100.0 g of the compound, what is the mass in grams of osmium that…

A: Since you have posted a question with multiple sub- parts, we will solve first three sub- parts for…

Q: You can also calculate percent composition from a formula. This is similar to percent abundance in…

A:

Q: If atoms of magenesium (Mg) and atoms of 10 chlorine (Cl) could bump into each other, could they…

A: Whether they combine to form any substance has to be determined The number of molecules would be…

Q: Materials engineers often create new alloys in an effort to improve the properties of an existing…

A: Here we have to determine the mol % and Wt % of Zn in the following given alloy Zn0.844Cd0.156O.

Q: Cinnamic alcohol is used mainly in perfumery, particularly in soaps and cosmetics. Its molecular…

A: Given, Molecular formula of Cinnamic alcohol is C9H10O  Mass of sample = 0.668 g     Required,…

Q: The percent composition by mass of an unknown chlorinated hydrocarbon was found to be 37.83%C,…

A:

Q: explain why the number of atoms and moles are different when the volumes are nearly identical?

A: 1. The table contains the data required to solve this problem.

Q: A pharmacist prepares an antiulcer medicine by mixing 286 g Na2CO3 with water, adding 150 g glycine…

A: Given information, 286 g Na2CO3 with water 150 g glycine (C2H5NO2)

Q: Materials engineers often create new alloys in an effort to improve the properties of an existing…

A: Given,  Formula of the alloy Zn0.838Cd0.162O

Q: The earth's ozone layer is under attack in part by chlorine released when UV radiation breaks apart…

A: The percentage weight of chlorine in CFC-11 is calculated as

Q: Sort the molecular compounds in the table into groups with the same empirical chemical formula. •…

A: Empirical formula is determined as the least common ratio of atoms .  Molecular formula is the exact…

Q: Question attached

A: Mass percentage It is the ratio of mass of an atom to the total mass of the compond. mass…

Q: Mass Aluminum Foil (g) 2.5415 Mass Filter Paper (g) 0.2777 Mass Filter Paper + Product (g) 35.6484…

A: Calculate mass of product by using given data--

Q: 4. What is the mass percent composition? Why is it useful?

A: Mass percent of each type of element in a compound is called the mass percent composition of the…

Q: Calculate the moles and mass of acetylsalicylic acid in each tablet (molar mass = 180.16 g/mol).

A:

Q: Can the relative amounts of the components of a mixture vary?Can the relative amounts of the…

A: The compound consists of chemically bounded components. While forming a bond there is a fixed ratio…

Q: If the mass of crucible and lid = 21.17 g Mass of crucible and lid and salt = 23.02g Mass of…

A: Given: Mass of crucible and lid = 21.17g Mass of crucible and lid and salt = 24.23g Mass of crucible…

Q: 4. A 0.8720-g sample of a mixture consisting solely of sodium bromide and potassium bromide yields…

A: Mass percentage is an important method to find out the concentration of a solution. It is usually…

Q: One molecule of an unknown compound is found to have a mass of  4.61 x 10-22 g. What is the molar…

A:

Q: What does the word “empirical” in empirical formula mean? If we know the empirical formula of a…

A: In chemistry, the empirical formula of a chemical compound is the simplest positive integer ratio of…

Q: a) A compound is found to contain 52.13 % carbon, 13.15 % hydrogen, and 34.72 % oxygen by mass.What…

A: (a) Given: Mass percent composition of hydrogen is 13.15% Mass percent composition of carbon is…

Q: Balance each chemical equation. (a) HI + NaOH Nal H20 --> (b) Ba(NO3)2 + H2S Bas HNO3 --> (C) CH4 O2…

A:

Q: What is the mass (in grams) of 3.2 x 1021 molecules of ibuprofen (C13H1802; molar mass 206.3 g/mol)?…

A: Given: The molar mass of ibuprofen = 206.3 g/mol We have to calculate the mass of 3.2×1021 molecules…

Q: Given a raw material of 2000 g Salicylic acid and 2500 g Acetic Anhydride, the actual yield is 1180…

A: % mass composition is given by  = (molar mass / given mass) × 100

Q: How many molecules are contained in a glass that holds 490 g of water? How many moles does that…

A: Given, water is contained in a glass. and amount of water is =490 gwe are asked to calculate, the…

Q: One molecule of a compound weighs 2.93 x 10-22 g. The molar mass of this compound is:

A: 1 mole = 6.0224 × 1023 molecules Molar mass = 6.0224 × 1023 × Molecular mass

Q: Q6 - Calculate the formula weight of the following molecules to three significant figures Q7…

A:

Q: The mineral iron pyrite (FeS2), typically, has a mass percentage of what is known as fool’s gold of…

A: Each FeS2 has 2 S atoms.  Each BaSO4(s) has 1 S atom. Hence each mol FeS2 will give 2 mol BaSO4(s)…

Q: How many atoms are present in 123 g of magnesium cyanide? a. 9.7 x 1023 b. 2.91x 1024 c. 2.83 x 1028…

A: Formula of magnesium cyanide is Mg(CN)2

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.