Concept explainers
(a)
Interpretation:
The total
Concept introduction:
According to
Here, n is number of moles and
(b)
Interpretation:
The total number of atoms in the given species needs to be calculated.
Concept introduction:
According to Avogadro’s law, in 1 mol of a substance there are
Here, n is number of moles and
(c)
Interpretation:
The total number of atoms in the given species needs to be calculated.
Concept introduction:
According to Avogadro’s law, in 1 mol of a substance there are
Here, n is number of moles and
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GENERAL CHEMISTRY(LL)-W/MASTERINGCHEM.
- A compound is composed of carbon, hydrogen, nitrogen and oxygen. When a 1.500-g sample of the compound is completely combusted, it yields 1.476 g of CO2and 0.605 g of H2O. In a separate analysis to determine nitrogen, 1.500 g of the compound is found to produce 0.313 g of N2. (a) Calculate the mass percent of each element in the compound. (b) Determine the empirical formula of the compound. (c) If the compound has a molar mass of 134 g/mol, what is the molecular formula?arrow_forwardCalculate the number of atoms of carbon (C) in 475 cm3 of the colorless gas butane at 0 °C and atmospheric pressure, where its density is 2.59×10-3 g cm-3. The molecular formula of butane is C4H10.arrow_forwardIdentify each of the following substances as an electrolyte or a nonelectrolyte and predict which will conduct electricity when dissolved in water: (a) ethanol, CH3CH₂OH(aq); (b) Pb(NO3)2(aq).arrow_forward
- 12. (b) A student knew that calcium hydroxide could be made by adding calcium to water. The student added 0.00131 mol of calcium to a beaker containing about 100 cm of water. A reaction took place as shown by the equation below, All the calcium hydroxide formed was soluble. Ca(s) + 2H,0(1I) → Ca(OH) (aq) + H,(g) (D Calculate the mass of calcium that the student added. mass of calcium = g (ii) Calculate the volume of hydrogen gas, in dm3, produced in this reaction at room temperature and pressure, RTP. volume of hydrogen gas = dm3 (iii) The student transferred the contents of the beaker to a 250 cm3 volumetric flask and water was added to make the solution up to 250 cm³. Calculate the concentration, in mol dm3, of hydroxide ions in the 250 cm³ solution. concentration = moldm 3arrow_forwardThe reaction of pentane, C5H12, with oxygen, O2, gives carbon dioxide and water. (a) Write a balanced equation for this reaction.arrow_forward(c) In the core of the modern Sun, the density is about 1.25 x 105 kg/m³. What is the concentration of hydrogen (in moles/m³) in the Sun's core, if the abundance of hydrogen is equal to the value shortly after big bang (i.e. 75% of the mass)? Convert your concentration to units of atoms/m³.arrow_forward
- 51. A concentrated perchloric acid solution is 65.8% HClO4 by mass and its density is 1.68 g mL−1. What volume (in litres) of the concentrated perchloric acid solution is needed to make 1.81 L of 2.62 mol L−1 HClO4(aq)?arrow_forward. A sample of 1.000 g of a compound containing carbon and hydrogen reacts with oxygen at elevated temperature to yield 0.692 g H2O and 3.381 g CO2.(a) Calculate the masses of C and H in the sample.(b) Does the compound contain any other elements?(c) What are the mass percentages of C and H in thecompound?(d) What is the empirical formula of the compound?arrow_forwardOne way the U.S. Environmental Protection Agency (EPA) tests for chloride contaminants in water is by titrating a sample of silver nitrate solution. Any chloride anions in solution will combine with the silver cations to produce bright white silver chloride precipitate. Suppose an EPA chemist tests a 200. mL sample of groundwater known to be contaminated with iron(III) chloride, which would react with silver nitrate solution like this: FeCl3(aq) + 3 AgNO3(aq) 3 AgCl(s) + Fe(NO3),(a9) The chemist adds 56.0 mM silver nitrate solution to the sample until silver chloride stops forming. She then washes, dries, and weighs the precipitate. She finds she has collected 2.8 mg of silver chloride. Calculate the concentration of iron(III) chloride contaminant in the original groundwater sample. Be sure your answer has the correct number of significant digits. mg L Submit Assignment Continue Accessibility Privacy O 2020 McGraw-Hill Education. All Rights Reserved. Terms of Use 888 %23 5 6 2 3 E R. G…arrow_forward
- Sodium reacts with chlorine to form sodium chloride. In an experiment a student reacted 1.50 g of sodium with 1.90 g of chlorine. (a) Write the balanced equation for this reaction.arrow_forwardWhen active metals such as sodium are exposed to air, they quickly form a coating of metal oxide. The balanced equation for the reaction of sodium metal with oxygen gas is 4Na(s) + O₂(g) 2Na₂O(s) Suppose a piece of sodium metal gains 2.05 g of mass after being exposed to air. Assume that this gain can be attributed to its reaction with oxygen. (a) What mass of O₂ reacted with the Na? (b) What mass of Na reacted? (c) What mass of Na₂O formed? 01.0arrow_forwardWhen tin comes into contact with oxygen in the air, tin (IV) oxide, SnO2 is formed. Sn (s) + O2 (g) SnO2 (s) A piece of tin foil, 8.25 cm x 21.5 cm x 0.600 mm (d = 7.28 g / cm), exposed to oxygen. (A) Assuming the reaction of all tin, what is the mass of the oxidized tin foil? (B) Air is about 21% oxygen by volume (d = 1.309 g / L at 25 ° C, 1 atm). How many liters of air is required to fully react with tin foil?arrow_forward
- General Chemistry - Standalone book (MindTap Cour...ChemistryISBN:9781305580343Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; DarrellPublisher:Cengage LearningChemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning