1.Arrange the following ions in order of decreasing size: Bri, Al3+, Nalt, Mg2+, II-. 2. Calculate the number of oxygen atoms in 15.0 g of calcium nitrate, Ca(NO3)2. 3. In your own words, explain the difference between an empirical formula and a molecular formula. Use an example to illustrate your explanation. 4. Sodium reacts with water to produce hydrogen gas and sodium hydroxide. If 15 g of sodium are added to 75 grams of water, calculate the mass of hydrogen gas that is produced. 5. Calculate the mass (in grams) of sodium sulfide that is needed to make 350 mL of a 0.50 mol/L solution.

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.