Lead compounds are often highly colored and are toxic to mold, mildew, and bacteria, properties that in the past were useful for paints used before 1960. Today we know lead is very hazardous and it is not used in paint, however, old paint is still a problem. If a certain lead-based paint contains 14.5% PbCr2O7 and 73.9% of the paint evaporates as it dries, what mass of lead (in grams) will be in a paint chip that weighs 0.58 g?

Q: Consider the following fictitious reaction. If the reaction begins with 0.362 mol of A and the…

A: Answer:- This question is answered by using the simple concept of stoichiometry which involves the…

Q: Aniline, C6H5NH2, is used to make many different chemicals, including dyes, photographic chemicals,…

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Q: The concept of determining which reactant is limiting and which is in excess is akin to determining…

A: Given:Number of bread slices = 36 slicesNumber of cheese slices = 45 slices1 sandwich = 2 slices of…

Q: Product X has a theoretical yield of 4.8 g. Isolated product X was placed in a plastic sample tray.…

A: Yield is the amount of product formed in a reaction. Theoretical yield is the amount of desired…

Q: when a mixture of solid Na2CO3 and NaHCO3 is heated, only NaHCO3 decomposes. The products of this…

A: A numerical problem to find the percentage by mass of NaHCO3, when it is present in a mixture with…

Q: A. If 365 ppb of Cd was observed, what is its equivalent in %(w/w)? B. A sample of plastic toy was…

A: Since you have asked a question with multiple subparts, we will answer only first 3 subparts for…

Q: If 10 grams of hydrogen are allowed to react with 100 grams of carbon dioxide... a) What is the…

A: Please see the attached image for the solution.If there are queries, please do not hesitate to ask.…

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: 2012 vapor. The on the cloth to form a waterproofing film (density = 1.0 g/cm³) of [(CH3)2 SiO],…

A: In one process for waterproofing, a fabric is exposed to (CH 3)2SiCl2 vapour. The vapour reacts with…

Q: are produced When 2.3 moles of diphosphorus pentoxide are decomposed into its elements? 2 P,0, - 4P…

A: Formula of  diphosphorous  pentoxide   = P2O5Atomic weight of Phosphorous = 31g  The above given…

Q: Morphine (C₁₇H₁₉NO₃) is a painkiller in the opiate family. A sample of morphine was discovered that…

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Q: percent yield

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Q: Suppose a piece of silver jewelry contains 7.78×1022 atomsatoms of silver (AgAg).

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

A: Molality is a concentration unit and is expressed as mol/kg. It expresses the amount of solute in 1…

Q: what will be the number of moles of CO2 in 88 g of CO2?

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Q: The reactant side of a balanced chemical equation is shown below. C₃Hg +50₂ → How many oxygen atoms…

A: Given reaction :  C3H8 + 5O2 ==>

Q: A mixture contains NaHCO3 together with unreactive components. A 1.56g sample of the mixture reacts…

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Q: 20. Sodium nitrite (NaNO₂) is often added to processed meat to enhance color and to protect against…

A: The question is based on the concept of pH of the solution.  it is defined as a negative logarithm…

Q: Balance the following chemical equation. 1. Al2(SO4)3 + Ca(OH)2 – Al(OH)3 + CaSO4haheTni neeerg…

A: We need to balance the given equations.

Q: A 6.5x103 kg sample of titanium (IV) chloride is reacted with a 1.24x103 kg sample of magnesium,…

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Q: Lead compounds are often highly colored and are toxic to mold, mildew, and bacteria, properties that…

A: Given that : % of  in PbCr2O7 in a lead-based paint = 13.6% % of the paint evaporates as it dries =…

Q: 4. The detonation of nitroglycerin proceeds as follows: 4 C3H5N3O9(l) → 12 CO2(g) + 6 N2(g) + O2(g)…

A: Given, The detonation of nitroglycerin: 4C3H5N3O9(l) → 12CO2(g) + 6N2(g) + O2(g) + 10H2O(g) Note:…

Q: A local water retention pond was found to have elevated mass concentration of mercury of 14 ng per…

A: Given data: Concentration of mercury = 14 ng/L Volume of water in swimming pool = 1250 m3   Known…

Q: 7-Combustion of 0.2121 grams of an organic substance sample with oxygen gas CO2 is kept in barium…

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Q: Lead compounds are often highly colored and are toxic to mold, mildew, and bacteria, properties that…

A: Given, A certain lead-based paint contains 12.9 % PbCr2O7 and 70.4 % of the paint evaporates Mass of…

Q: What was the percentage by mass of Cr in the ore sample?

A: Absorbance A = 1.618Molar absorptivity ε = 2.81 Lmoll = 1 cm

Q: Use the solubility generalizations on the information page to predict if one or more precipitates…

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Q: Balance th

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Q: Morphine (C₁₇H₁₉NO₃) is a painkiller in the opiate family. A sample of morphine was discovered that…

A: Given: When morphine undergoes combustion, carbon dioxide is produced. Mass of mixture            =…

Q: Some chemical reactants are listed in the table below. Complete the table by filling in the…

A: Oxidation number represents the number of electrons lost or gain by the atom to get stable…

Q: The chemical equation 2H2O yields to 2H2+O2 Represents what type of reaction

A: The reaction given is, => 2 H2O → 2 H2 + O2

Q: Morphine (C₁₇H₁₉NO₃) is a painkiller in the opiate family. A sample of morphine was discovered that…

A: Mass % of morphine = Mass of morphine x 100/Mass of mixture

Q: SIC1₂ vapor. proofed by coating it with a silicone layer. This is done by exposing the cloth to…

A: Given as, n(CH3)SiCl 2 +2nOH→2nCl- +nH2O+[(CH 3)2SiO] n ​

Q: (3b-101) Balance the following equations (be sure to first convert any chemical names into…

A: Given:

Q: An alloy is found to be 41.8% Zn and the rest is Cu. If 15.0 g of Cu is added to 45.0 g of This…

A: Mass of the alloy = 45g% of copper in the alloy = (100-41.8) = 58.2%% of zinc in the alloy =…

Q: The concept of determining which reactant is limiting and which is in excess is akin to determining…

A: A chemical reaction in which the reactant molecule that has a lesser number of moles, according to…

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: When 12.0 g of carbon is burned in oxygen during an experiment, only 40.4 g of carbon dioxide was…

A: Weight of 1 mole of compound is called the molar mass of that compound.

Q: Lead compounds are often highly colored and are toxic to mold, mildew, and bacteria, properties that…

A: Given that -  Percentage of PbCr2O7 = 18.1%  Percentage of evaporated paint = 82.3%    Weight of…

Q: When elemental phosphorus oxidizes, it produces a covalently bonded molecule known as…

A: Given :-  Mass of P4 = 1.33 g  Mass of O2 = 5.07 g   To calculate :-  Theoretical yield of P4O10

Q: Lead compounds are often highly colored and are toxic to mold, mildew, and bacteria, properties that…

A:

Q: The concept of determining which reactant is limiting and which is in excess is akin to determining…

A:

Q: In a terrible accident, a solution consisting of 2.37 kg of nitric acid, HNO3, was spilled on the…

A: Given: The mass of HNO3 that was spilled = 2.37 kg The mass of Na2CO3 added = 2.00 kg We have to…

Q: A 0.3459 g tablet that contains bicarbonate generates 1.24 x 10−3 moles of CO2. What is the percent…

A: Given information,    Mass of tablet is 0.3459 g    Moles of CO2 is 1.24 x 10−3

Q: Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements:…

A: Given reaction,Mass of nitrogen gas produced = 2.80 gThe molar mass of Mass of sodium azide required…

Q: Solutions containing (NH4)2CO3(aq) and CaCl2(aq) are mixed. Will a precipitate form? What is the…

A:

Q: Calculate the percent yield.

A: Given :- mass of Cr = 94.1 g  Actual yield of Cr2O3 = 138 g  To calculate :- the percent yield…

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.