How many grams of gold (Au; atomic mass = 197.0 g/mol) contains 2.5 x 1020 gold atoms?          (Avogadro’s number, No = 6.023 x 1023/mol)

Q: how many ions or atoms of each element are in 160.5 g of the following substances?  a) H2 _?_ x1025…

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Q: Q.4. Zinc metal can be obtained from zinc oxide, ZnO, by reaction at high temperature with carbon…

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Q: 3. nydrate! A student was given a sample of hydrated Na,CrO4 (molar mass of anhydrous Na2CrO4: 162.0…

A: Mass of hydrated sample = 2.58 g Mass of anhydrous sample = 1.77 g Molar mass of Na2CrO4 = 162.0…

Q: The smell of a burning match is due to the formation of sulfur oxides. We can represent the relevant…

A: The given reaction is: S+O2→SO2......(1) The mass of sulfur burned is 4.8 g.

Q: How many atoms of hydrogen are in a 1.0 g sample of acetic acid, CH3COOH? The molar mass of acetic…

A: As per the given data we haveMass of acetic acid=1gMolar mass of acetic…

Q: Šome of the formulas could be either molecular or empirical formulas; however, some can only be…

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Q: composition by mass: C – 8.7 % ; F -13.8 %; Cl – 77.5 % Calculate the empirical formula of CFC11.…

A: 1) First convert mass into mole by dividing molar mass Then divide least value of mole to all values…

Q: 3. Law of Conservation of Mass. (a) In a combustion reaction, 46.0 g of ethanol reacts with 96.00 g…

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Q: 3. Lithium has two stable isotopes with masses of 6.01512 u and 7.01600 u. The average molar mass of…

A: Answer is explained below.

Q: - Why do we use the "mole" in chemistry. How does it relate to the periodic table? a) What is the…

A: The relationship between mole and mass is as follows:       Mole = Mass Molar mass ⇒Mass =…

Q: 1. A compound that contains only carbon, hydrogen, and oxygen is 40.54% C and 5.44% H by mass. What…

A: “Since there are multiple questions in this question and it is not mentioned that which one has to…

Q: A compound containing chromium, Cr; chlorine, Cl; and oxygen, O, is analyzed and found to be 33.6%…

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Q: 2XO3(g) → 2XO2(g) + O2(g) a. In the box on the right, draw the content of the sample after the…

A: The balanced chemical equation shows the relationship between the number of moles of reactants and…

Q: Straight-chain, saturated carboxylic acids, a class of hydrocarbons, has the general formula C,H2n++…

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Q: The formula of acetic acid is CH3COOH (alternatively written as C₂H4O₂). What is the molar mass of…

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Q: What is the empirical formula of an unknown compound that contains 48.02% Carbon, 18.74% hydrogen,…

A: The simple number of atoms present in the molecule is shown below.

Q: e empirical formula a compound is C 2H 4O and its molecular weight was determined to be…

A: Given; molecular mass = 44 g/mol

Q: TRUE OR FALSE. The value of Avogadro’s number is 6.02 x 1023 g/mol.

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Q: What mass of AuCl3 (MW 303 g/mol) contains 5.0 x 1023 atoms of Cl?

A: One AuCl3 molecule contains one Au and three Cl atoms.

Q: N2(8) + 3 H2(8) → 2 NH3(8)

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Q: A compound containing hydrogen, H; boron, B; and oxygen, O, is analyzed and found to be 3.90%…

A: The empirical formula of a chemical compound is the simplest whole-number ratio of the atoms in the…

Q: 4. Glucose a simple sugar, is a constituent of human blood and tissue fluids and is a principal…

A: Consider the given information is as follows; Molecular weight = 180.2 g/mol Empirical formula =…

Q: 3.) What mass (in grams) of fluorine gas (F2) is needed to react completely with 17.8 g of sulfur…

A: Given : Mass of sulfur (S8) = 17.8 g Molar mass of F2 = 38 g Molar mass of S8 = 256.48 g 24 mol F2 =…

Q: You are trying to determine the formula for hydrated CaSO4 and you found the following: Mass of…

A: Given: Mass of hydrated compound = 3.09 g Mass of only CaSO4 = 2.43 g  So the mass of water present…

Q: Prevacid is used to treat gastroesophageal reflux disease (GERD). The chemical formula of Prevacid…

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Q: 2 Al(s) +3 Br2 (4)- - Alz Bre (s) What mass of Br2, in grams, is required for complete reaction with…

A: 2Al (s)     +          3Br2 (l)…

Q: 33. Sulfurous acid is unstable in aqueous solution and gradually decomposes to water and sulfur…

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Q: What amount of CuSO4•5H,O, in moles, does this mass represent? mass = 1.787 g %3D X mol resubmit…

A: Given : Mass of CuSO4.5H2O = 1.787 g And molar mass of CuSO4.5H2O = 249.69 g/mol.

Q: 6) Chlorophyll has the formula C5s H72 Mg N4 Os. How many grams of carbon are required to combine…

A: Introduction: We have to tell the mass of carbon in chlorophyll.

Q: 3. An oxide of chromium is made up of 5.20g chromium and 5.60 g oxygen. What is the empirical…

A: Given,  Mass of Cr = 5.20 g  Mass of O = 5.60 g What is the empirical formula of the oxide = ?

Q: A 6.40 g sample of a compound is burned to produce 8.37 g CO, 2.75 g HO, 1.06 g N, and 1.23 g SO.…

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Q: 14 - Aluminum Oxide is formed when aluminum reacts with oxygen in the air. How many moles of Al,03…

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Q: 1. Find the necessary amount of Ag,CO; in grams in order to obtain 79.1 g of silver. A92CO3 · Ag(s)…

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Q: containing chromium, Cr; chlorine, Cl; and oxygen, O, is analyzed and found to be 33.6% chromium,…

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Q: 6) How many grams of cobalt are in 356 g of Co(NO3)2? 7) How many grams of sodium are in 1.50 kg of…

A: It is applicable of percentage composition where we are required to find the mass of a particular…

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.