Nitrogen trifluoride, NF3, is used in the production of flat panel displays. It is also a potent greenhouse gas. The average concentration of NF3 in the atmosphere increased from 0.02 parts per trillion (ppt) in 1978 to 0.454 ppt in 2008. What was the concentration of NF3 in 2008 in mg per kg of air?

Q: 2.350g of CuSO4·nH2O was heated to produce 1.502 g of anhydrous CuSO4.   Calculate the moles of…

A: CuSO4·nH2O (s) + Heat →CuSO4 (s) + nH2O  Mass of hydrate (CuSO4·nH2O), mbefore heating = 2.350 g…

Q: 2. Calculate the boiling point for ethyl acetate. The boiling point for ethyl acetate is [ Select ]…

A:

Q: The calcium content in a 0.4367-g sample of phosphate rock was determined by first dissolving the…

A: Here we have to determine mass percentage of calcium present in 0.4367 gram phosphate rock  if all…

Q: What is the theoretical yield of MgO from the combustion of 5.25 x 10^23 atoms of Mg and 4.69 x…

A:

Q: The hardness of water (hardness count) is usually expressed in parts per million (by mass) of CaCO3,…

A: Given,The water sample with a hardness count of 175 mg CaCO3/L

Q: Suppose 1.19 g of potassium nitrate is dissolved in 300. mL of a 0.10 M aqueous solution of ammonium…

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Q: Predict the reactants of this chemical reaction. That is, fill in the left side of the chemical…

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Q: If 23.3 grams of an aqueous solution of manganese(II) sulfate, MnSO4, contains 5.96 grams of…

A: Percentage by mass – ratio of Mass of solute to the Mass of solution and multiplied by 100 is…

Q: What is the molarity of a barium chloride solution prepared by dissolving 9.9 grams of BaCl2•2(H2O)…

A: Molarity = (Mass/molar mass)(1000/V(ml)).Mass = 9.9g.Molar mass = 244.26g/mol.Volume = 151.0ml.

Q: What is the percentage of calcium carbonate present in the original mixture?

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Q: To determine the amount of platinum in an alloy, a 8.565 g8.565 g sample of an alloy containing…

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Q: reaction is: Co(s) + HgCl (aq) → COCI(aq) + Hg(1)

A: Given , Mass of Co = 1.25 g Molar mass of Co = 59.0 g/mol Molar  mass of Hg = 200 g/mol Mole =…

Q: What is the mass (in kg) of 6.89 x 1025 molecules of CO2?  The molar mass of CO2is 44.01 g/mol.

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Q: Titanium occurs in the magnetic mineral ilmenite (FeTiO3), which is often found mixed up with sand.…

A: Ilmenite can be separated from sand with magnets

Q: A chemical plant uses electrical energy to decompose aqueous solutions of NaCl to give Cl2, H2, and…

A: Solution stoichiometry involves the calculation of concentration of solutions in the given…

Q: What mass of HCl in grams is neturalized by a dose of milk of magnesia containing 3.26g Mg(OH)2?

A: Given :- mass of Mg(OH)2 = 3.26 g  To calculate :- mass of HCl (in g)

Q: What was the percent of potassium chlorate in the mixture

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Q: In the spring of 1984, concern arose over the presence of ethylene dibromide, or EDB, in grains and…

A: The mass and moles of EDB in one flour is calculated as,

Q: The density of ammonia, NH3, is 7.71 x 104 g/mL. Calculate the number of moles of ammonia in a 31.9…

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Q: Complete and balance the reaction equation in Figure 7. What is the molecular formula of the salt…

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Q: Carborundum (silicon carbide), SiC, is a very hard material used as an abrasive on sandpaper and in…

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Q: Calcium chloride reacts with sodium hydroxide to form solid calcium hydroxide, Ca(OH)2 What is the…

A: Balanced equation is given by:

Q: When magnesium hydroxide reacts with nitric acid, it produces magnesium nitrate and water. Mg(OH)2 +…

A: The given balanced equation is :-  Mg(OH)2 + 2HNO3 → Mg(NO3)2 + 2H2O

Q: Balance the chemical equation below using the smallest possible whole number stoichiometric…

A: Recall the given equation,                      CH3CH24CH3 g  +  O2 g  →  CO2 g  +  H2O gWe have…

Q: A chemical plant uses electrical energy to decompose aqueoussolutions of NaCl to give Cl2, H2, and…

A: The given equation -  Calculate the number of moles of Cl2 - Now calculate the moles and mass for…

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…

A:

Q: A chemical plant uses electrical energy to decompose aqueous solutions of NaCl to give Cl₂, H₂, and…

A: Part A) mass of H2 = 5.4×104 kg Part B) mass of NaOH = 2.1×106 kgExplanation:Step 1:- Given…

Q: Copper (II) chloride, CuCl2(aq) solution is reacted with aluminum hydroxide, Al(OH)3(aq) solution.…

A: Given that ,  Copper (II) chlorolide ,CuCl2(aq) solution is reacted with aluminum hydroxide,…

Q: a) What mass of strontium nitrate (Sr(NO3)2) would be required to prepare 2.000 L of a 0.0180 M…

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Q: Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means…

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Q: 49.40 grams of Fe(NO3)3 are dissolved in enough water to prepare 550.0 ml of solution. Calculate the…

A: 1.) First we need to calculate the moles from given mass. Then using moles and volume we can…

Q: Hydrogen cyanide, HCN, is prepared from ammonia, air, and natural gas (CH4) by the following…

A: Given Chemical Reaction: 2NH3 + 3O2 +2CH4 -------> 2HCN +6H2O. To solve this problem we will be…

Q: Hydrogen cyanide, HCN, is prepared from ammonia, air, and natural gas ( CH4) by the following…

A: The balance chemical reaction :  2NH3(g) + 3O2(g) + 2CH4(g) ---Pt---> 2HCN(g) + 6H2O(g)  Mass of…

Q: Suppose a student starts with 2.3865 g of a sand mixture and separates the components into 1.3012 g…

A: The objective of this question is to calculate the percentage of SiO2 in the starting mixture of…

Q: The US Environmental Protection Agency (EPA) places limits on the quantities of toxic substances…

A: Formulae used: Molarity =Mole soluteSolution in Litre

Q: Barium oxalate is used as a colorant to produce the green color in fireworks.  Imagine that you have…

A: Given,when barium hydroxide octahydrate ( Ba(OH)2·8H2O) reacts with oxalic acid…

Q: One way to analyze for the amount of phosphorus in a rock is to precipitate the phosphorus as…

A: Given the mass of the rock sample = 2.832 g Percent of Ca3(PO4)2 = 86.52% => mass of Ca3(PO4)2 in…

Q: Measurements of the exhaust gases of a hydrogen-fueled engine indicate a composition of 71.0% N2,…

A:

Q: 2 Balance the chemical equation for the reaction of acetic acid with sodium hydroxide CH.COOH (aq)+…

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Q: What is the molarity of a solution that has 5.024 X 1023 atoms of Glucose (C6H12O6)?

A: Assuming there is one litre of solutionGiven5.024x 1023 atoms of glucose are present

Q: What is the mass (in grams) of 5.03*10^22 molecules of CO2 molecules?

A: 1 mole = 6.0226 x 1023 Molar mass of CO2 = 44.01 g/mol Given that: Number of molecules of CO2 = 5.03…

Q: Determine the mass in grams of 3.00 × 10²¹ atoms of arsenic. (The mass of one mole of arsenic is…

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Q: Use the concept of molarity to calculate the molarity of a solution prepared by dissolving 25.00 g…

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Q: Predict the reactants of this chemical reaction. That is, fill in the left side of the chemical…

A: An acid reacts with a base to form salt and water. A general acid-base reaction is as follows:

Q: A mixture of butene, C4H8, and butane, C4H10, is burned in air to give CO2 and water. Suppose you…

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Q: In an experiment, a student combines 75.0 mL of a 0.200 M iron (III) chloride solution with 125.0 mL…

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Q: The concentration of gold in seawater is 0.0027 ug/L. What mass of gold (in kg) is present in the…

A: Given: The concentration of gold in seawater = 0.0027 ug/L. Volume =  3.23 x 1011  km3  To…

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".