Concept explainers
(a)
Interpretation:
Formula of magnesium nitrite has to be written.
Concept Introduction:
Ionic compounds are electrically neutral. This is because there are equal numbers of opposite charges present in the ionic compounds. Empirical formula gives a relative number of atoms of each type of element that is present in the compound to the smallest possible whole-number as subscript. If two moles of polyatomic ions are present, then the polyatomic ion is represented in parenthesis.
(b)
Interpretation:
Formula of lithium phosphate has to be written.
Concept Introduction:
Refer part (a).
(c)
Interpretation:
Formula of barium cyanide has to be written.
Concept Introduction:
Refer part (a).
(d)
Interpretation:
Formula of ammonium sulfate has to be written.
Concept Introduction:
Refer part (a).
Want to see the full answer?
Check out a sample textbook solutionChapter 2 Solutions
Chemistry: Principles and Practice
- Given that the density of argon is 1.78 g/L under standard conditions of temperature and pressure, how many argon atoms are present in a room with dimensions 4.0 m 5.0 m 2.4 m that is filled with pure argon under these conditions of temperature and pressure?arrow_forwardGive the name and formula of the compound formed from the following elements: (a) cesium and bromine; (b) sulfur and bar-ium; (c) calcium and fluorine.arrow_forwardWhich compound of calcium is used for swimming pool water and sewage treatment? (A) Calcium hydroxide, Ca(OH)2 (B) Calcium hypochlorite, Ca(OCl)2 (C) Calcium carbonate, CaCO3 (D) Calcium oxide, CaOarrow_forward
- (a) Atoms are very small compared to objects on the macroscopic scale. The radius of a nickel atom is 125 pm. What is this value in meters and in centimeters? cm -23 (b) The mass of a single nickel atom is 9.75×10 g. Suppose enough Ni atoms were lined up like beads on a string to span a distance of 31.3 cm (12 inches). How many atoms would be required? atoms What mass in grams of Ni would be used? Could you weigh out this amount of nickel using a typical laboratory balance? (c) Taking the density of nickel metal to be 8.91 g/cm, calculate the mass of metal needed to form a piece of Ni wire with the same length as the distance in b, but with a diameter of 1.00 mm. Hint: The volume of a cylinder is n times its radius squared times its height. (V = nr h) How many nickel atoms does this represent? atomsarrow_forwardHow many protons, neutrons, and electrons, respectively, are present in the ionic species 19779Au3+? (A) 79, 197, 76; (B) 79, 118, 3; (C) 76, 118, 79; (D) 79, 118, 76;arrow_forward1. (a) 5.00g of caffeine is found to contain 2.47g of carbon, 0.26g of hydrogen, 1.44g of nitrogen and 0.83g of oxygen. The molar mass of caffeine is twice the mass of its empirical formula unit.(R.A.M. C=12.01, H=1.01, O=16.00, N=14.01)(i) Calculate the empirical formula of caffeine.arrow_forward
- D1. One atom has 20 protons and a mass number of 44. Another atom has 20 protons and a mass number of 40. (a) What is the similarity and dissimilarity in these atoms? (b) The atom combines with phosphate ion. Write the chemical formula and chemical name of the compound. (c) What is the valency and oxidation number of an atom in the elemental form?arrow_forwardA student weighs a sample of carbon on a balance that is accurate to 0.001 g. (a) How many atoms are in 0.001 g of C?(b) The carbon is used in the following reaction: Pb₃O₄(s) +C(s)→3PbO(s) +CO(g) What mass difference in the lead(II) oxide would be caused by an error in the carbon mass of 0.001 g?arrow_forwardWrite the empirical formula of the compound formed by (a) Al3+ and Cl - ions, (b) Al 3+ and O2 - ions, (c) Mg2+ and NO3 ions.arrow_forward
- Obtain an estimate for the number of atoms in the universe. Make the following assumptions: (a) All of the atoms in the universe are hydrogen atoms in stars. (This is not a ridiculous assumption because over threefourths of the atoms in the universe are in fact hydrogen. Gas and dust between the stars represent only about 15% of the visible matter of our galaxy, and planets compose a far smaller fraction.) (b) The sun is a typical star composed of pure hydrogen with a density of 1.4 g/cm^3 and a radius of 7x10^8 m. (c) Each of the roughly 100 billion stars in the Milky Way galaxy contains the same number of atoms as our sun. (d) Each of the 10 billion galaxies in the visible universe contains the same number of atoms as our Milky Way galaxy.arrow_forwardGive the name and formula of the compound formed from the following elements: (a) sodium and nitrogen; (b) oxygen and strontium; (c) aluminum and chlorine.arrow_forwardCompound Y contains lead and oxygen only. 15.0 g of Y was found to contain 12.99 g lead. Find out the empirical formula of Y. (Relative atomic mass: Pb = 207.2, O = 16.0)(a) Calculate the mass of oxygen present in 15.0 g Y. (b) Hence, find out the empirical formula of the oxide.arrow_forward
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistry: An Atoms First ApproachChemistryISBN:9781305079243Author:Steven S. Zumdahl, Susan A. ZumdahlPublisher:Cengage Learning
- Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage Learning