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When 0.75 g of Mg(s) is reacted with excess HCl(aq) in a calorimeter of total heat capacity (container plus contents) of 550.0 J/ºC, what is the expected temperature change ?T? The reaction and enthalpy is given below. 2 Mg(s) + 2 HCl(aq) --> 2 MgCl2(aq) + 2 H2(g) ?H = -456.8 kJ/mol
A 224mL sample of an aqueous solution contains 2.80% MgCl2 by mass. Exactly one-half of the magnesium ions are Mg?28, a beta emitter with a half-life of 21 hours
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Which of these statements correctly describes a diamond?
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Each polypeptide in the alpha keratin dimer has 3.5 residues per turn, resulting in the slight winding, or twist, around the other polypeptide
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