needed 1or tins question. One of the hydrates of KF is potassium fluoride dihydrate . A 63.1 gram sample of KF 2 H20 was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, how many grams of the anhydrous compound remained?

Q: How many atoms or ions of each element are in 157.3 g of the following substances? (a) H₂ x 1025 H…

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Q: Calculate the mass percent of H in B4H9CI. %

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Q: A student is given a 1.8686 g of an unknown copper compound. Following isolation by displacement by…

A: Given: Mass of Cu = 0.3685 g Mass of compound = 1.8686 g

Q: Samples of several compounds are decomposed, and the masses of their constituent elements are…

A: The empirical formula of each compound has to be given. (a) Given data contains, Mass of Ba=2.677 g…

Q: A) What is the formula of magnesium melonite dihydrate?  B) What is the mass % of melon in copper…

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Q: Calculate the mass percent composition of nitrogen in eachcompound.(a) N2O (b) NO (c) NO2 (d) N2O5

A: Hi, since you have posted multiple subparts we will answer the first three subparts for you. Kindly…

Q: If 5.00 moles of MgO were reacted with excess moles of P,Ojo, what mass of Mg(PO4)2 would be…

A: Number of moles of MgO = 5.0 moles

Q: What are the molecular and empirical chemical formulas of a compound made up of these molecules? H…

A: Molecular formula: It indicates the exact number of atoms of each elements present in the…

Q: How many H atoms are there in (2.22x10^2) grams of NH3?

A: The answer to the following question is given as:

Q: 12 (a) Calculate the # of moles of the alement present in 99.9 g of nickel (b) Calcolate the mass in…

A: Given a) Mass of Ni             = 99.9 g b) No.of moles of Ni = 0.251 mol c) No.of moles of Ni  =…

Q: The molar mass of M(OH)2 formed by the hypothetical metal M, is 144.096 g/mol what is the molar mass…

A: Molar mass of a compound is equal to the sum of the molar masses of all the elements. The molar mass…

Q: What is the mass of the compound C8H18 (Mm = 114.26 g.mol-1) that contains 7.20x1022 hydrogen atoms?

A: Given :- molar mass of C8H18 = 114.26 g.mol-1  Number of H atoms = 7.20 × 1022 atoms   To calculate…

Q: What is the mass percentage of C in codeine, C₁₈H₂₁NO₃? Provide an answer to two decimal places.

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Q: The mass of water obtained in a combustion analysis of a 1.000 g sample of an organic compound…

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Q: What is the % molecular mass of Iron in Fe2S3?

A: The percent mass of an element in a compound can be calculated by using the following formula:

Q: How many grams of manganese(II) hydroxide contain 2.80 grams of Mn2+?

A: The formula for manganese hydroxide is Mn(OH)2  The molar mass of Mn = 54.93g/mol The molar mass of…

Q: Determine the empirical formula of each of the following compounds. (Type your answer using the…

A: Data given:  (a) Number of moles of chlorine = 0.063 mol Number of moles of oxygen = 0.22 (b) Mass…

Q: What is the percent by mass of hydrogen in HC2H3O2?

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Q: If you have 9.407 * 10^23 atoms of lead how mant grams of lead (IV) phosphate can you make   How…

A: To determine the moles of Lead present in the given number of atoms, As 6.022×1023 atoms are…

Q: One mole of (NH4)2HPO4 contains how many moles of hydrogen atoms?

A: First count the number of Hydrogen atoms in 1 mol of given formula.

Q: One mole of water contains 6.022 × 1023 hydrogen atoms

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Q: Hydrated sodium tetraborate (N a 2 B 4 O 7 ·x H 2 O)is commonly called borax. Chemical analysis…

A: The hydrated form of borax lose water in the presence of heat resulted in the formation of Anhydrous…

Q: One dose of an antacid contains 860. mg each of Mg(OH)2 and Al(OH)3. How many moles of each…

A: Given:- One dose of an antacid contains 860. mg each of Mg(OH)2 and.     Al(OH)3. To find:- How many…

Q: QUESTION 8 (a) In the certain hydrated salt MSO3-4H20, the mass percentage of H2O is 44.71%.…

A: The question is based on the concept of moles . we have been provided with a hydrate. we have to…

Q: What is the mass percentage of each element in the compound Al2O3? Enter the percent mass of…

A: Answer:- This question involves the calculation of mass percent of each element present in the given…

Q: Na +  H2O --->  NaOH +  H2 A mass of 6.2 moles of sodium reacts with an excess of water.  What mass…

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Q: How many moles of oxygen atoms are there in (7.11x10^2) grams of P4O6 (MM = 219.88 g/mol)?

A: Given information: (7.11 x 102) grams of P4O6 (MM = 219.88 g/mol) The mole is calculated as…

Q: What is the percent (by mass) of oxygen in citric acid, C6H8O7.

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Q: A 3.06 mg sample of a compound containing carbon, hydrogen, and oxygen underwent combustion…

A: “Since you have posted multiple questions, we will provide the  solution   only to the first…

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.