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: 8.) Considering the equation 2 NaI (ao) + Cl₂(g) → 1₂ (s) + 2 NOCI (aa) How many grams of Sodium be…

A: 2 NaI (aq) + Cl2(g) ==> I2(s) + 2NaCl (aq)  Given Mass of Iodine = 49.5 g  Molar mass of Iodine =…

Q: Given the following skeletal half reaction in basic solution: MnO4 (aq) → MnO2(aq) Fill in the…

A:

Q: Antimony is alloyed with lead to increase the rigidity of components used in the construction of…

A:

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: A sample of ultrapure silicon was reacted with excess oxidizing yielding SiO₂. After proper…

A: Given that -  Mass of Silicon dioxide SiO2 =  3.1754 g  Percentage of ultrapure silicon = 99.98%…

Q: When 250.0 mL of .2500 M Li2CO3 (aq) were mixed with 350.00 mL of .1500M AlBr3 (aq), 2.500 grams of…

A: Molarity of Li2CO3 = 0.2500 M Volume of Li2CO3 = 250 mL = 0.250 L Molarity of AlBr3 = 0.1500 M…

Q: 4. Calculate the number of moles of CuSO4•5H2O in 100 g of the solid.

A: Given details, Mass (m) = 100g Atomic mass of CuSO4.5H2O = 249.68 g/mol To calculate the number of…

Q: A crystal of the mineral pharmacosiderite, Fe3(AsO4)2(OH)3•5H2O, contains what percent of  oxygen by…

A: The molecular formula of the crystal pharmacosiderite is = Fe3(AsO4)2(OH)3•5H2O One molecule of the…

Q: The equation for the reaction between sodium hydrogen carbonate and sulfuric acid at room…

A:

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?

A:

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

A:

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: Balance the following chemical equation (if necessary): 2 C₂H₂(g) + 15 O₂(g) → 10 H₂O 10 CO 10 2

A: Balanced chemical equation: Balance chemical equation can be define as the reaction in which number…

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: Consider the reaction of solid P₄ and chlorine gas to form gaseous phosphorus trichloride. The…

A: The reaction given is P₄(s) + 6 Cl₂ (g) → 4 PCl₃ (g)

Q: How many moles and grams of nitric acid, HNO3 (aq), are there in 200.0 mL of 2.00 M HNO3 (aq)?

A:

Q: Consider the reaction of solid P4 and chlorine gas to form gaseous phosphorus trichloride. a) Write…

A:

Q: Groundwater often has low levels of dissolved oxygen because it is not continually exposed to the…

A:

Q: Precipitates used in the gravimetric determination of uranium include NazU2O7 (MM = 634.0 g/mol),…

A: Calculate : which weighing forms having the greatest mass of precipitate from a given quantity of…

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

A:

Q: While investigating mole ratios, a group of students collected data for the chemical reaction 2…

A: Given, 2NaOH(aq) + CaCl2(aq)→ 2NaCl(aq) + Ca(OH)2(s) mass of NaOH react = 3.00 g mass of CaCl2 react…

Q: What is the mass percentage of O in CO2? Provide an answer to two decimal places.

A: Given,  The mass percentage of O in CO2 is:

Q: One way the U.S. Environmental Protection Agency (EPA) tests for chloride contaminants in water is…

A: Hi, as you have posted 2 questions and have not mentioned which one you want us to solve for you.…

Q: Iodine is prepared both in the laboratory and commercially by adding CI2 (g) to an aqueous solution…

A:

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: 7.5 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: Quartz, SiO2, contains 46.7% silicon. What mass of silicon is present in 370 g of quartz?

A: To solve this problem we have to calculate the mass of silicon present in quartz .

Q: A 3.72 g sample of iron ore is transformed to a solution of iron(II) sulfate, FeSO4. This solution…

A: Given : Molarity of K2Cr2O7 = 0.110 M Volume of K2Cr2O7 = 60.9 ml. Reaction given :

Q: A crime scene analyst found out a 10 mm thick metal plate was penetrated by 10 bullets that caused a…

A: Given the thickness of the metal plate, h = 10 mm  Total number of holes formed = 10  Diameter of…

Q: 12.00 g of a potassium hydroxide, KOH solution is mixed with 40.00 g of lead (II) nitrate, Pb(NO3)2…

A: Given  Mass of KOH = 12 gram  Mass of Pb( NO3 )2  = 40 gram  Limiting reactant = ?

Q: What mass of magnesium oxide is produced

A: Given :- number of moles of Mg = 1.18 mol  To calculate : mass of MgO (in g)  Molar mass of MgO =…

Q: How many grams of nickel(II) nitrate are needed to produce 35.7 g nickel(II) phosphate in the…

A: Given data, mass of nickel(II) phosphate = 35.7 g, molar mass of nickel(II) phosphate=366.02 g mol-1…

Q: Over the years, the thermite reaction has been used for welding railroad rails, in incendiary bombs,…

A: Fe2O3 + 2Al.....> 2Fe + Al2O3 Mass of Fe = 14.4 g Molar mass of Fe = 55.8  Moles of Fe =…

Q: Balance the following chemical equation CB,H.(g) + O₂(g) - > CO₂(g) + H₂O(g)

A: Is an equation in which the number of atoms for each element in the reaction and the total charged…

Q: An organic compound was found to contain only C, H, and C1. When a 1.50 g sample of the compound was…

A: To given solution-Explanation:Complete solution.

Q: 1.How many moles of CuO can be produced from 1.11 mol of Cu2O in the following reaction?…

A: The amount of substance is usually defined in terms of mole. The mole is the SI unit of the quantity…

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: Solid copper and aqueous iron(II) sulfate (FeSO4) are produced by the reaction of aqueous copper(II)…

A: A chemical equation is a short version to write a chemical reactions. It uses the symbols of…

Q: A student decides to conduct an experiment by using two different flasks and two different gas…

A: Average kinetic energy and rms velocity calculation:

Q: he doesn't have time to repeat the steps of heating, cooling crucibles, and remeasuring the mass.…

A: Amount of water in a hydrate is calculated by using the formula  Amount of water in a hydrated salt…

Q: A beaker contains 100.0 mL of water. To it is added 10.0 mL of dilute nitric acid (HNO3). Calculate…

A: Volume of water = 100.0mL  Volume of dilute nitric acid = 10.0mL Total volume = 110 mL  Density of…

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

A:

Q: Phosphorus trichloride, PCl3, is produced from the reaction of white phosphorus, P4, and chlorine:…

A:

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

A: Formulae used: Molarity =Mole soluteSolution in Litre

Q: What are the pharmaceutical uses of paratonic solutions?

A: Paratonic solutions are the the solutions which don't have the same osmotic pressure i.e the…

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".