The mass of K3PO4 needed to prepare 250.0mL of an aqueous solution in which PO4-3 concentration is 0.0550M.   The answer is ………………………

Q: -X2X X+B-C. a) Assuming that both A and B àre kept at constant concentrations a and b, show that the…

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Q: What mass in grams of CO2 is evolved in the complete decomposition of a 2.300-g sample that is 38.0%…

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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: The U.S. Environmental Protection Agency (U.S. EPA) monitors air quality in the United States. Lead…

A: Here in question lead concentration is given in µg/m3. In 2011 the lead concentration is 0.10µg/m3.…

Q: 50 cm of a gaseous hydride of phosphorus, PH, reacts with exactly 150 cm³ of chlorine, Cl, to form…

A: Given that 50 cm3 of gaseous hydride of phosphorus, PHn reacts with exactly 150 cm3 of chlorine, Cl2…

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

A: Given;

Q: What is the mass percentage

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Q: An alloy of solder is tin and lead. Calculate the number of moles in each that are present in 100…

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Q: The U.S. Environmental Protection Agency (U.S. EPA) monitors air quality in the United States. Lead…

A: Given that there was lead release into the atmosphere and number of atoms of lead released can be…

Q: The source of oxygen that drives the internal combustionengine in an automobile is air. Air is a…

A: (a) The balanced equation for the reaction of nitrogen and oxygen giving nitric oxide gas is, The…

Q: What is the mass of fish, in kilograms, that one would have to consume to obtain a fatal dose of…

A: Convert the unit of lethal mass of HgCl2: 1 g=1000 mgLethal dose=0.2 g                     =0.20…

Q: A chemist adds 365.0 mL of a 2.1 mol/L nickel(II) chloride (NiCl,) solution to a reaction flask.…

A: Molarity is the moles of substance present per unit volume. Molarity = moles of solute / volume By…

Q: Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s) + O2 (g) 2M9O…

A: From the given reaction we can see that 2 moles of Mg burns to produce 2 moles of MgO  hence moles…

Q: . a) A mixture of LiHCO, and sand weighing 8.41 g is heated. After cooling, the residue composed of…

A: Since you have posted question with multiple sub-parts, we are entitled to answer the first only.

Q: 011: calculate mass needed to prepare 5.0L of 0.10N Na,CO,(105.99g/mol) from standard solid.

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Q: What is the approximate density of 1M HNO3 aq?   Thank you for your help!

A:

Q: What mass in grams of CO, is evolved in the com- plete decomposition of a 2.300-g sample that is…

A:

Q: 7.5 g aluminum was heated with sodium chlorate (NaClO3) in an evacuated glass vessel. The heating…

A: A numerical problem based on the oxidation of Al into Al2O3, which is to be accomplished.

Q: 1- Na3AlF6 can be made by the reaction below: Al203 (s) + 6 NaOH (aq) + 12HF (6) → 2 Na:AlF, (s) + 9…

A: Moles of Al2O3 = Mass/Molar mass = 6.55g/(101.96gmol-1) = 0.0642 moles Moles of NaOH = Molarity  ×…

Q: Find the Mass of 3.65 x10² mole K,SO,?

A: Number of moles of K2SO4 = 3.65 × 10–2 mol  Molar mass of K2SO4 = 174.26 g/mol

Q: What is the percentage composition of C6H12O6

A: Glucose composition  means that carbon, hydrogen and oxygen are present in the ratio 1 : 2 : 1 in…

Q: Fluorides of the noble gas xenon can be formed by reaction with fluorine under high temperature and…

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Q: In one analysis, the density of ozone in an air sample was found to be 5.00  10−8 mol/L. What is the…

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Q: When the supply of oxygen is limited, iron metal reacts with oxygen to produce amixture of FeO and…

A: Given: Mass of iron metal = 20.00 g Mass of oxygen gas = 11.20 g Mass of remaining gas of oxygen =…

Q: 5-) 1,200 grams of aluminum of an impure NH4AI(SO4)2 sample is converted into Al203 by precipitation…

A: Given data contains, Mass of NH4Al(SO4)2 is 1,200 grams. Mass of Al2O3 is 0.1798 grams. (a) The mass…

Q: An empty flask weighs 128.950 g. After vaporization of a sample of volatile liquid at a temperature…

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Q: 1.58g of magnesium hydrogencarbonate was added to a 1.68 mol/L solution of acetic acid, CH3COOH in…

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Q: Seawater contains an average of 1.08 x 103 ppm of Na* and 270 ppm of SO42. Calculate the molar…

A: Given, Concentration of Na+ ion = 1.08 * 103 ppm Concentration of SO42- ion = 270 ppm Average…

Q: The analysis of a sample of the mixture obtained during the industrial preparation of nitric acid…

A: This problem can be solved from the basic physical chemistry problem.

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: The U.S. Environmental Protection Agency (U.S. EPA) monitors air quality in the United States. Lead…

A: According to the given graph, Lead concentration in 2000 (Ci) =0.24 μg/m3  Lead concentration in…

Q: is a method wherein nitrogen from the air is directly combined with H2 under high pressure and…

A: Reactive nitrogen is used for the nitrogen compounds that support growth. So, ammonia is a reactive…

Q: 76. Most wine is prepared by the by yeast: C6H12O6(aq) →→2C₂H5OH(aq) + 2CO₂(g) How many grams of…

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Q: After determining the composition of a mixture of KClO3 and KCl, it is found that the calculated…

A: Here we are determining the composition of mixture by using decomposition of KClO3  and…

Q: 1. The amount of carbon dioxide in the Earth's early atmosphere decreased because it was used by…

A: Carbon dioxide (CO2) is consumed in photosynthesis by plants, that resulted in its decreased…

Q: It takes 3.500 in³ of mercury to make one manometer. Find the price of the mercury used to make 19…

A: As you have not provided the cost for Mercury , So here I will be taking a sample cost of 100 to…

Q: 0.4334 g sample of canned tuna was analyzed by the Kjeldahl method; 24.61 mL of 0.1180 M HCI were…

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Q: Children's toys and jewelry were assessed for their contarmination by potentially toxic elements…

A: 1 Ppb = 0.000001 mg/g 1 Ppm = 1 mg/L 1 ug = 0.001 mg

Q: Pentaerythritol tetranitrate (abbreviated PETN, chemical formula C5H8N4O12) is an explosive material…

A: The explosion of PETN can be represented by:…

Q: What is the mass percentage of C in caffeine, CsH1oN4O2? Provide an answer to two decimal places.

A: Mass percentage of Carbon in Caffeine is 6.18%

Q: Exactly 0.642 grams of pure Na2CO; was dissolved in 100.00 mL of 0.0746 M HCI. What mass (in grams)…

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Q: N2 in the atmosphere Plants Process X + NH3 in soil NH, NO2 NO3 State THREE (3) impacts that can be…

A: Please find your solution below : The process by which organic nitrogen is converted to ammonia by…

Q: The Le Blanc Process for the manufacture of soda ash encompasses the four steps: NaCl + H2SO4 =…

A: The Le Blanc Process for the manufacture of soda ash encompasses the four steps. The balanced…

Q: In the reaction N2(g) + 2O2(g) ---- > 2NO2(g) what is the volume ratio of N2 to NO3 A. 2:5 B. 2:1…

A: There is an error in the question. It should be NO2, and not NO3. I've corrected and answered…

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

A: Stoichiometry is used to relate the amount of reactants and products in a balanced chemical…

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

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Q: The aluminum (FW=26.98 g/mol) in a 1.000-g sample of impure ammonium. Aluminum sulfate was…

A: Solution - According to the question - Formula used -  A is the mass of the product of known…

Q: hildren's toys and jewelry were assessed for their contamination by potentially toxic elements…

A: Hii there, As there are multiple sub parts posted. we are answering first-three sub parts . If you…

Q: You need to calculate the number of P₄ molecules that can formfrom 2.5 g of Ca₃(PO₄)₂. Explain how…

A: Solution;-  No. of atoms = No. of P atoms in 1 P4 molecule × No. of molecules No. of molecules =…