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Chapter 2: Q47P (page 40)
Gallium has two naturally occurring isotopes,69Ga(isotopic mass 68.9256 amu, abundance 60.11%) and71Ga(isotopic mass 70.9247 amu, abundance 39.89%). Calculate the atomic mass of gallium.
Atomic mass of gallium is the total sum of atomic mass from isotope 69Ga and isotope 71Ga.
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State the mass law(s) demonstrated by the following experimental results, and explain your reasoning:
Experiment 1: A student heats 1.27 g of copper and 3.50 g of iodine to produce 3.81 g of a white compound; 0.96 g of iodine remains.
Experiment 2: A second student heats 2.55 g of copper and 3.50 g of iodine to form 5.25 g of a white compound, and 0.80 g of copper remains.
A compound of copper and sulfur contains 88.39 g of metal and 44.61 g of nonmetal. How many grams of copper are in5264 kg of the compound? How many grams of sulfur?
Why was it necessary for separation techniques and methods of chemical analysis to be developed before the laws of definite composition and multiple proportions could be formulated?
State the mass law(s) demonstrated by the following experimental results, and explain your reasoning:
Experiment 1: A student heats 1.27 g of copper and 3.50 g of iodine to produce 3.81 g of a white compound; 0.96 g of iodine remains.
Experiment 2: A second student heats 2.55 g of copper and 3.50 g of iodine to form 5.25 g of a white compound, and 0.80 g of copper remains.
What monatomic ions do potassium (Z = 19) and iodine (Z = 53) form?
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