A 20.0-gram sample of impure NaClO3 produces 4.72 L of oxygen (STP). What is the percentage purity of the NaClO3? 2NaClO3(s) -> 2NaCl(s) + 3O2(g)     74.8 %     81.0 %     83.0 %     85.0 %     87.0 %

Q: Concentration of Solutions Children's toys and jewelry were assessed for their contamination by…

A: Solution: Given :                      molecular wt. of As =   74.92 g/mol…

Q: .) Refer to the following equation: 3Cu(s) + 8HNO3(aq) → 3Cu(NO;);(s) + 2NO(g) + 4H,0(1)

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Q: If a 25 kg LPG tank is 30% butane (C4H10) , how many molecules of butane are contained in the tank?…

A: The concentration of a substance can be measured in terms of mass by mass percentage. This…

Q: What volume of 3.51 M KOH is required to prepare 211.0 mL of 0.750 M KOH? a. 1.24 × 10–2 mL b.…

A: Given: First Values of KOH Concentration, M1= 3.51MVolume,   V1 = ????       Second Values of KOH…

Q: Toxic Cr(VI) can be precipitated from an aqueous solution by bubbling SO2 through the solution. How…

A: Given Volume = 3.00 × 108 L  molarity = 4.00×10-2 mM

Q: The following reaction is known to have a 65.0% yield of copper. 3 Cu(NO3)2(aq) + 2 Fe à 2…

A: We have given that 3 Cu(NO3)2(aq) + 2 Fe(s) → 2 Fe(NO3)2(aq) + 3 Cu(s) and the reaction yield 65%…

Q: Sodium reacts with oxygen to produce sodium oxide in a synthesis reaction. A chemist needs to…

A: We can determine the mass of Na to start with by considering the balanced equation.  The reaction…

Q: 1.00 kg nitrogen reacts with 0.500 kg hydrogen to produce ammonia.  Calculate the grams of ammonia…

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Q: A water sample is found to contain the pollutant chlorobenzene with a concentration of 15 ppb (by…

A: Given, The concentration of chlorobenzene present in the water sample = 15 ppb (by mass) The amount…

Q: High fructose corn syrup is used industrially as a sweetener in everything from carbonated beverages…

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Q: 2. Making a cheese sandwich can be represented by the chemical equation%; Bd, + 2Ch > 2BdCh What…

A: According to the reaction, Bd2 + 2Ch ----> 2BdCh   2 bread slices combine with 2 cheese slices to…

Q: More than 40% of the world's population has limited access to clean water. One proposed method for…

A: Separation technique is used for the purification and separation of substance. Some of the…

Q: A student needs exactly 25.0 mL of a 1.5M solution of NaOH (molar mass: 40.00 g/mol). They have…

A: Given: Concentration of NaOH = 1.5 M Volume of solution required = 25.0 mL = 0.025 L…

Q: 15. What volume (in L) of cobalt can be produced when 55.0 kg of colbalt(III) oxide reacts with 5.00…

A: A numerical problem based on reduction reaction, which is to be accomplished.

Q: The patient shows a serum level of cholesterol of 253 mg/dl (MWT = 386 g/mol), express this level in…

A: Given,  Concentration of cholesterol in mg/dL = 253 mg/dL  Molecular weight of cholesterol = 386…

Q: Analysis of a 31.7 g sample of water revealed a mass percent for lead of 3.3%. Calculate the number…

A: Analysis of 31.7 g of water was done and the mass percentage of lead was found to be 3.3%,

Q: A student found that her mixture was 13% NH4Cl, 18% NaCl and 75% SiO2. Assuming that her…

A: Given               In mixture                       % of NH4Cl = 13%                       % of…

Q: A concentration of carbon monoxide of 4000  ppm  (0.400 %  by mass) in air is lethal in about half…

A: Given: Volume of car = 2.9 m3. Since 1 m3 = 1000 L Hence volume of car in L = 2900 L

Q: a) If sea water contains 3.5% NaCl, by mass, how many grams of NaCl can be obtained from 1.00 gallon…

A: Density of sea water = 1.02 g/mL

Q: Toxic Cr(VI) can be precipitated from an aqueous solution by bubbling SO₂ through the solution. How…

A: Given, 2CrO42- + 3SO2 + 4H+ -----> Cr2(SO4)3 + 2H2O Molarity of Cr(VI) solution = 6.00 × 10-2 mM…

Q: cetic acid (HC2H3O2HC2H3O2) is the active ingredient in vinegar. Calculate the mass percent…

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Q: If the furnace initially contained 22.322.3 kg of solid calcium oxide and 10.510.5 kg…

A: Given: Mass of CaO = 22.3 kg Mass of P4O10 = 10.5 kg  To find: mass of calcium phosphate in kg…

Q: The mass percent of a solution is 12.00% and contains 30.0 grams of MgCl2. What is the total mass of…

A: Mass %=Mass percentage is calculated as the mass of a component divided by the total mass of the…

Q: Toxic Cr(VI) can be precipitated from an aqueous solution by bubbling SO2 through the solution. How…

A:

Q: What is the mass percentage of C in caffeine, C₈H₁₀N₄O₂? Provide an answer to two decimal places.

A: Mass percentage of an element in a molecule is calculated by using the formula Mass % of element = n…

Q: Part A Iron is mined from the earth as iron ore. Common ores include Fe2 O3 (hematite), Fe3 O4…

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Q: The percentage of argon gas in dry air A. 0.035% B. 0.065% C. 20.9% The percentage of other gases in…

A: Composition of gases in dry air is  1 O2      20.9% 2.N2      78.1% 3 Ar      0.93%

Q: A 20.0-gram sample of impure NaClO3 produces 4.72 L of oxygen (STP). What is the percentage purity…

A: Percentage purity can be calculated by back calculation of the amount of O2 should be produced.

Q: All of the platinum ever mined = 25 ft3 What is the price of all of the paltinum ever mined?…

A: The conversion of volume of platinum from 25 ft3 into cm3 can be done as,

Q: A monolayer containing 3.21 × 10 –6 g of oleic acid has an area of 20.0 cm 2. The density of oleic…

A: Given, mass of oleic acid = 3.21 × 10 –6 g            density of oleic acid = 0.895 g/mL…

Q: What is the mass, in grams, of exactly 230 sodium atoms? Would it be the same answer only in grams?…

A: Steps to convert atoms to grams • Convert atoms to moles - Divide the number of atoms with Avogadro…

Q: What is the mass in grams of 1.37 x 10^24 atoms of nickel? ______ grams How many nickel atoms are…

A: Calculate mass and number of atoms of Nickel in the given data in the question---  Value--  Avogadro…

Q: Mixtures are divided into two classes based O 1. mixtures and matter on their appearance. What are…

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Q: A chemist adds 1.30 L of a 5.83 x 10 mmol/L copper(II) fluoride (CuF,) solution to a reaction flask.…

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Q: A mixture of potassium chloride and potassium bromide weighing 3.595 g is heated with chlorine,…

A: Given: weight of mixture = 3.595g  Total mass of Kcl after reaction n= 3.129g  To determine: KBr…

Q: A student found that her mixture was 13% NH¼CI, 18% NaCl and 75% SIO2. Assuming that her…

A: on addition of the given percentages, the total percentage of the solution comes out to be as 106%…

Q: In the following reaction, how many grams of silver can be produced from 49.1 g copper?…

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Q: Magnesium will burn in air to form both Mg3N2 and MgO. What mass of each product would be found if…

A: Given,  Magnesium will burn in air to form both Mg3N2 and MgO.…

Q: is heated with 1.80 gof bromine. All the bromine is used upj and 2.07 g of magnesium bromide is the…

A: Massof magnesium remains unreacted = 6.856g

Q: 1- lopper and nitric acis Porassium ioaize

A: "Since you have asked multiple questions, we will solve the first question for you ( as per our…

Q: A study of the Earth by The National Aeronautics and Space Administration (NASA) determined there…

A: Given  7.00 x 1011 tons of carbon    Conversion factor:  1 ton = 907.19 kg  1 kg = 1000 g = 103 g…

Q: What mass of calcium chloride, CaCl2, is needed to prepare 3.950 L of a 1.49 M solution? Select…

A: 3.95 L of 1.49M calcium chloride solution is to be prepared.

Q: Toxic Cr(VI) can be precipitated from an aqueous solution by bubbling SO2 through the solution. How…

A: Answer: 1.44 × 106 g of SO2 is required.

Q: A student is given a 6.216 g mixture of iron filings, calcium chloride, and sand. He separates the…

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Q: ct one: a. III, II, IV, I b. III, IV, II, I H 1 = NH₂ || IV NH2₂

A: Here more the lone pair on nitrogen are free for donation more stronger is the base and least is its…

Q: She begins to set up the problem but leaves one step blank because she is unsure. What should she…

A: The moles of Cl2 in a known mass are, number of moles=given massmolecular mass…

Q: How many carbon atoms are there in a 1.0-carat diamond? Diamonds are a form of pure carbon. ( 1…

A: Given:1 carat=0.20gWe know,Atomic mass of C=12.0107g/molalso, 1 mol of C=6.022×1023 atoms of C

Q: A freighter carrying a cargo of uranium hexafluoride sank in the English Channel in late August…

A:

Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".