1.00 g of hydrated potassium carbonate, K2CO3•nH2O, is heated to 250 °C to give 0.836 g anhydrous K2CO3. What is the value of n?

Q: 3. Н.РО, 4. Al(ОН),

A: Given, 3. H3PO4 4. Al(OH)3      Required,                    Percentage composition of the above…

Q: How many grams of hydrogen H2 are produced by the reaction of 33 grams of magnesium Mg?

A: m H2 = ? m = 33 g Mg Mg + 2HCl --> H2 + MgCl2 MW H2 = 2 g/gmol MW Mg = 24.3 g/gmol MW MgCl2 =…

Q: How many grams of NH4NO3 are required to produce 33.0 grams of N20?

A: Given :- mass of N2O = 33.0 g  To calculate :- mass of NH4NO3 (in g)

Q: What is the theoretical yield of SO3 produced by 4.58g of S?

A: Balanced chemical equation:2S+3O2 --------------à2SO3From the balance chemical equation,2…

Q: What substances are present, and what are their masses, after the reaction of 10.00 g ofmagnesium…

A: THE IDEA HERE IS THAT CHEMICAL REACTIONS MUST OBEY THE LAW OF MASS CONSERVATION , WHICH STATES THAT…

Q: What is the mass percentage of Cl in hydrochlorothiazide, C₇H₈ClN₃O₄S₂?

A:

Q: What will happen to calcium phosphate Ca3 (PO4) 2 when heated from 60 ° C to 100 ° C?

A: The solubility product of Ca3(PO4)2 is 2.0 X 10-29

Q: What mass of silver oxide, Ag2O, is required to produce 25.0 g of silver sulfadiazine, AgC10H9N4SO2,…

A: Mass of silver sulfadiazine = 25 g Molar mass of silver sulfadiazine = 357.14 g/mol Moles of silver…

Q: 195 kg of H3PO4 was extracted from 310 kg of natural phosphorite. Natural phosphorite Calculate the…

A: Molecular formula of calcium phosphate is Ca3​(PO4​)2​.Its molar mass is 3(40)+2(31)+8(16)=310…

Q: What is the mass percentage of C in caffeine, C18H10N4O2

A: The mass percentage is calculated by the formula, mass%=mass of elementmass of compound×100

Q: A 5.276 g sample of Al-Mg alloy is digested in nitric acid (to Al*3 and Mg*²). The solution is…

A: Given: Mass of sample = 5.276 g The solution is diluted = 500 mL three 100 mL of solution titrated…

Q: Which of the following elements will be directly produced when Silicon burns with Helium? A. Sulfur…

A: Nuclear reaction: A nuclear reaction must cause a transformation of at least one nuclide to another.…

Q: 1 B,0, + 3 Mg → 3M9O + 2 B 5. (a) How many grams of boron can be obtained from 10.00g of B,0,? (b)…

A: Given balanced equation is as follows. 1B2O3+3Mg→3MgO+2B

Q: Select acidic oxide from the choices given.     Na2O2     KOH     P4O6     Na2O     CaO

A: We have to predict the nature of oxide .

Q: 3. Ag,0 → Ag + 0, 4. Rb + S,→ Rb,S -> 5. NH, + HCI NH CI 1)

A:

Q: Potassium iodate solution was prepared by dissolving 1.022 g of KIO3 (214.00 g/mol) in a 500-mL…

A: Molarity of a solution = Number of moles of solute/ volume of solution in L Number of moles of a…

Q: What % fraction of the electrons would you have to remove from a 5.0 mg sphere iron in order to make…

A: Given:  mass of Fe sphere = 5 mg = 0.005 g charge on sphere= 3C  we know that, atomic mass of…

Q: What is Manganese ?

A: The arrangement of elements in increasing order of atomic number in the tabular form is termed…

Q: Calculate the energy given off if 75.5 g of NH3 is reacted with O2.

A:

Q: Is boron the sole nonmetallic element of group 3A?

A: A nonmetal is an element that mostly lacks the characteristics of a metal. Physical characteristics…

Q: There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of…

A: All atoms of all elements and charges should be balanced in a balanced chemical reaction.

Q: A sample of cesium metal reacted completely with water, evolving 2.028 mmol of dry H 2 at 19 degrees…

A:

Q: Fe2S3 -----> 2Fe + 3S What mass of sulfur (S) is produced from the thermal decomposition of 12.5g…

A: Molar Mass of Fe2S3 = 207.9 g Molar Mass of Sulphur = 32.065 g

Q: Explain  question 2 what is the true percentage of water in BaCl2•2H2O?

A: Because water has a molar mass of 18.015 g/mol, it follows that 2×18.015 g of water for every…

Q: You started your preparation of common alum with 1.4971 g of aluminum foil. What is the theoretical…

A: Formula of alum is KAl(SO4).12 H2O Molar mass is 474.38 g/mol We have to calculate theoritical…

Q: If there are 6.2x1022 molecules of calcium carbide, CaC2, what mass of acetylene (C2H2) can be…

A: The solution of above question is-

Q: The calcium from a sample of limestone weighing 699mg was precipitated as CaC2O4 and ignited to CaO…

A: The ignition of calcium oxalate can be described as follows: CaC2O4  →  CaCO3  + COCaCO3   →  CaO  +…

Q: 5. The phosphorus in a sample of phosphate rock weighing 0.5428 g is precipitated as MGNH,PO4 .6H20…

A:

Q: Sr + _02→_SrO How many moles of strontium would synthesize with 3.5 moles of O2?

A: Explanation to the correct answer  is given below

Q: What is the mass percentage of C in caffeine, C₈H₁₀N₄O₂?

A: The concentration of an element in a compound or mixture is represented using mass percent. The mass…

Q: A 5.276 g sample of Al-Mg alloy is digested in nitric acid (to Al*3 and Mg"). The solution is…

A: Given that -  Mass of sample of alloy, Al-Mg = 5.276 g  Mass of alumina, Al2O3 = 1.444 g  Molar mass…

Q: How many tons of Ca3(PO4)2 are necessary to prepare 5.0 tons of phosphorus if the yield is 90%?

A: The reaction can be given as follows: 2Ca3(PO4)2+6SiO2+10C(s)→6CaSiO3+10CO+P4 The given percent…

Q: Give the chemical formula for (a) carbonic acid, (b) sodiumcyanide, (c) potassium hydrogen…

A: The composition of a chemical compound can be presented in a very precise was with the use of…

Q: 109. Elixirs such as Alka-Seltzer use the reaction of sodium bicar- bonate with citric acid in…

A:

Q: Equivalent weight of Mg(OH)2 is O 58 O 92 O 29 O 39

A:

Q: (CO2) Limestone (CaCO,) Firebox Lime (CaO) Thermal decomposition of limestone (calcium carbonate).…

A:

Q: Calculate the mass of oxygen that will be prepared through the decomposition of 50 kg of potassium…

A: Potassium chlorate decomposes into potassium chloride and oxygen. The equation for the balanced…

Q: If 0.232 moles of K[Ag(CN)2], MW = 199.0 g/mol, were used in the recovery reaction above, what mass…

A: Given data :  Moles of K[Ag(CN)2] = 0.232 moles  Molar Mass of Zn(CN)2= 117.4 g/mol  1 mol of…

Q: Heating a sample of Na2CO3⋅xH2O weighing 4.640 g until the removal of the water of hydration leaves…

A: A sample of Na2CO3.xH2O weighing 4.640 g is heated until the removal of water of hydration leaves of…

Q: what is the mass percentage of C in hydrochlorothiazide, C7H8ClN3O4S2?

A: Mass percentage=Mass of particular speciesTotal massx100Hydrochlorothiazide molecular…

Q: What is equivalent weight of Hydrochloric acid if you know the atomic weight H = 1, Cl = 35.5

A: The given data- The molar mass of Hydrogen = 1 The molar mass of chlorine = 35.5 To calculate =…

Q: What is the mass percentage of C in codeine, C18H21NO3?

A:

Q: How many grams of water would be lost if a 2.000 gram sample of CsF:1½H2O were heated?

A: Given : Mass of CsF.1½H2O = 2.000 g Molar mass of CsF.1½H2O = Atomic mass of Cs + Atomic mass of F +…

Q: If 10.7 kg Al reacts with an excess of Fe,O3, how many kilograms of Al,0, will be produced?

A: Given :-  2Al(s) + Fe2O3(s)  -----> Al2O3(s)  + 2Fe(l)  Mass of Al = 10.7 kg  To be calculated :-…

Q: 1A. What weight (in grams) of oxalic acid (MW= 90 g/mol) will be required to prepare 1 liter of 0.25…

A:

Q: If 5.3 g of gallium reacts with 5.3 g of oxygen to produce gallium oxide, what will we be left with…

A: Limiting reactant :-  A reactant whose number of moles are less than the number of moles  required…

Q: What is the molar mass of ginkgolide B (C 20H 24O 10), a complex compound isolated from the ginkgo…

A: Molar mass of a chemical compound is equal to the mass of one mole of chemical compound. Unit of…

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.