Answered: 2) A compound containing only oxygen…

2) A compound containing only oxygen and nitrogen is 30.45% N by mass. The molecular weight is 90 g. What are the empirical and molecular formulas of the compound? (12)

Chemistry In Focus

7th Edition

ISBN:9781337399692

Author:Tro, Nivaldo J.

Publisher:Tro, Nivaldo J.

Chapter4: Molecules, Compounds, And Chemical Reactions

Section: Chapter Questions

Problem 35E: The active ingredient in aspirin is acetylsalicylic acid, which has the chemical formula C9H8O4. An...

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When white phosphorus burns in air, it produces phosphorus(V) oxide. P4(s)+5O2(g)P4O10(s);H=3010kJ What is H for the following equation? P4O10(s)P4(s)+5O2(g)
3.50 A test of an automobile engine's exhaust revealed that g of NO2 was emitted in 10 minutes of operation. How many moles of NO2 would this engine release if it were used for a 45-minute commute, assuming that this mea- sured number is representative of the emission under all circumstances?
89 A number of compounds containing the heavier noble gases, and especially xenon, have been prepared. One of these is xenon hexafluoride (XeF6), which can be prepared by heating a mixture of xenon and fluoride gases. XeF6 is a white crystalline solid at room temperature and melts at about 325 K. A mixture of 0.0600 g of Xe and 0.0304 g of F2 is sealed into a 100.0-mL bulb. (The bulb is heated, and the reaction goes to completion. Then the sealed bulb is cooled back to 20.0°C. What will be the final pressure in the bulb, expressed in torr?
itamin B12 , cyancobalamin, is essential for human nutrition. Its molecular formula is C63H88CoN14O14P . A lack of this vita min in the diet can lead to anemia. Cyanocohalamin is the form of the vitamin found in vitamin supplements. l type='a'> What is the molar mass of cyanocobalamin to two decimal places? How many moles of cyanocohalamin molecules are present in 250 mg of cyanocobalamin? What is the mass of 0.60 mole of cyanocobalamin? How many atoms of hydrogen are in 1 .0 mole of cyanocobalamin? What is the mass of 1.0107 molecules of cyanocobalamin? What is the mass (in grams) of one molecule of cyanocobalamin?
One way to remove nitrogen oxide (NO) from smoke-stack emissions is to react it with ammonia. 4NH3(g)+6NO(g)5N2(g)+6H2O(l) Calculate (a) the mass of water produced from 0.839 mol of ammonia. (b) the mass of NO required to react with 3.402 mol of ammonia. (c) the mass of ammonia required to produce 12.0 g of nitrogen gas. (d) the mass of ammonia required to react with 115 g of NO.
Propane, C3H8, is the fuel of choice in a gas barbecue. When burning, the balanced equation is C3H8+5O23CO2+4H2O a What is the limiting reactant in cooking with a gas grill? b If the grill will not light and you know that you have an ample flow of propane to the burner, what is the limiting reactant? c When using a gas grill you can sometimes turn the gas up to the point at which the flame becomes yellow and smokey. In terms of the chemical reaction, what is happening?
A 9.107 g sample of an amino acid containing the atoms C, H, N, and O, was subjected to combustion analysis and yielded 8.802 g of carbon dioxide, 4.505 g of water, and 4.600 g of nitrogen dioxide. Its molar mass was measured to be 91.07 g/mole. Determine the empirical formula using the following steps. A. (12) Calculate the number of moles of CO, H,0, and NO,. B. (24) Calculate the masses and moles of carbon, hydrogen, and nitrogen from the appropriate products. C. (8) Determine the mass and moles of oxygen in the original sample. D. (6) Use the data to derive the empirical formula and the molecular formula.
A 19.51 g sample of impure methylamine, which contains 72.58% (by mass) of CH;NH: , is reacted with 30.81 g of pure oxygen gas: 2.1 4CH, NH,(2) + 90,(8) - 4C0,(8) + 10H,0(?) + 2N;(8) 2.1.1 What is the percentage yield of this reaction if 5.54 g of nitrogen gas is collected? 2.1.2 In another experiment, this impure methylamine was used as follows: • An unknown mass of the impure compound is dissolved in enough water to make 500.0 m of solution. • 20 ml of this solution was transferred by pipette to a clean 250 ml volumetric flask and made up to the mark. • The molarity of the CH;NH; in the final solution was determined to be 0.103 M. Determine the mass of CH;NH; present in the original amount of impure compound used make this solution.
0 3.76 Consider the mixture of propane, C,Hg, and O2 shown below. (a) Write a balanced equation for the combustion reaction that Occurs between propane and oxygen. (b) Which reactant is the limiting reactant? (c) How many molecules of CO, H2O, C;Hs, and O, will be present if the reaction goes to completion?
Write a balanced chemical equation based on the following description: solid CHO is burned with oxygen gas to 10 produce gaseous carbon dioxide and water vapor 2 C₂²H₂O² H(aq) + 9 O₂(g) →6 C4O₂(g) + 8 H₂O²- (1)
7. Using the laboratory data table below, calculate the number of water molecules (X) in a hydrate of barium chloride, BaCl₂ X H₂O. (6A) 18.42 g Mass of clean, dry test tube 20.75 g Mass of test tube and hydrated barium chloride Mass of test tube and contents after heating 20.41 g
(4)Lindane is a toxic insecticide that causes r dizziness in humans. Find the molecular formula for lindane given its percent composition: 24.78% carbon, 2.08% hydrogen, and 73.14% chlorine. The appreciate molar mass is 290 g/mol.

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