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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Calculate the molecular (formula) mass of each compound:(a) iron(II) acetate tetrahydrate; (b) sulfur tetrachloride; (c)potassium permanganate.
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- (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_forwardCalculate the mass ( in g) of 1.2 x 10^24 atoms of molybdenum, Mo.arrow_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
- Explain how the atomic mass unit (amu) is defined and explain how the definition of an amu, in turn, determines the value of Avogadro’s number (NA), which is 6.0221 x 1023arrow_forwardA sugar crystal contains approximately 2.0×10^17 sucrose (C12H22O11) molecules. What is its mass in mg?arrow_forwardConsider a 101.3 g sample of the compound manganese(IV) perchlorate. (d)Using the formula Mn(ClO₄)₄ (MM = 452.74), what is the percent by mass of Cl in the compound? (e)how many moles of manganese perchlorate are in 101.3g? (f)How many moles of oxygen are in 101.3 g of manganese perchloratearrow_forward
- Determine the number of ethylene molecules, C 2 H 4 , in a 7.3 g sample of ethylene, [ans: 1.6 X 10 23 molecules]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_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_forward
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