Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Give the name and formula of the compound formed from the following elements: (a) sodium and nitrogen; (b) oxygen and strontium; (c) aluminum and chlorine.
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- A compound Y containing carbon, hydrogen and oxygen only have the following composition by mass:C: 40.0% ; H: 6.7% ; O: 53.3%(a) Calculate the empirical formula of the compound. (Relative atomic masses: H =1.0, C = 12.0, O = 16.0) (b) Given that the relative molecular mass of compound Y is 180. Find its molecular formula.arrow_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_forwardWhat is the molecular weight of sugar, C6H12O6 in atomic mass units? And If you had one mole of sugar molecules, how much would it weigh?arrow_forward
- Chlorophyll molecules are responsible for the green pigmentation of plants. Differing chemically isolated molecular chlorophyll compounds are named as "Chlorophyll X" (where "X" is a variable denoting the actual molecular fragments which are represented by the labels R2, R3, R7, Rg, R17). Suppose one molecule of ChlorophyllX contains 5 oxygen atoms, and Chlorophyll X is 13.14 % oxygen by weight. Using only this information and the atomic mass of oxygen, determine the molecular mass of Chlorophyll X. The Chlorophyll X molecule contains one magnesium atom. What mass of magnesium is found in 7.11 g of Chlorophyll X compound?arrow_forwardCuSO4(aq)+ Zn(s) → Cu(s)+ ZnSO4(aq) Write the name of the copper-containing product and the copper-containing reactant.arrow_forward(b) 0.36 M NaHCO3 lons: O3 Na* NaH* O CO;²- O NaHC* O HCO3 [cation*] = i M [anion] = Marrow_forward
- A student performed a similar experiment to the one you performed: They took a crucible and lid, cleaned them, heated them over a flame, and after cooling found their combined mass to be 22.538 g. The student then added a sample of zinc(II) sulfate hydrate (ZnSO4·“n”H2O) to the crucible so the combined mass of the sample, crucible, and lid was 25.896 g. They heated this sample for 10 minutes with the lid ajar, let it cool, and measured the mass of the crucible, sample, and lid to be 25.054 g. a. Based on this experiment, what is the formula for they hydrated zinc(II) sulfate compound? b. The student later looked on the reagent bottle for zinc(II) sulfate hydrate and found the actual formula was ZnSO4·7H2O. If everything had been done correctly, what value should the student have expected for the final mass of their sample, crucible, and lid after heating?arrow_forwardExplain how the atomic mass unit (amu) is defined and (ii) explain how the definition of an amu in turn determines thevalue of Avogadro’s number, which is 6.0221 x 10^23.arrow_forwardDetermine the mass in grams of 8.16 x 10^21 atoms of zinc. (The mass of one mole of zinc is 65.39 garrow_forward
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