Select the correct answer. excess sodium hydroxide is added to a solution containing 4.6 grams of magnesium chloride. a reaction takes place according to this equation: 2naoh(aq) + mgcl2(aq) → 2nacl(aq) + mg(oh)2(s). the magnesium hydroxide produced by the reaction was collected and weighed. if the mass of the magnesium hydroxide was 2.7 grams, what was the percent yield? use the periodic table. a. 48% b. 59% c. 61% d. 96%

What element breaks down into yttrium-90?

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced. be sure your answer has the correct number of significant digits.