<span>By definition, the first ionization energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. </span><span />
B. When scientific understanding changes.
Atoms are the smallest particales of an element that can take part in a chemical reaction. During a chemical reaction no particles are created or destroyed. The atoms are simply rearranged from the reactants to the products, mass is NEVER lost or gained in chemical reactions...Mass is ALWAYS conserved. :) Hope this helped
Answer:
0.0125 mol.
Explanation:
<em>Molarity of a solution is the no. of moles of a solute per 1.0 L of the solution.</em>
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M of HCl = 0.5 mol/L.
V = 25.0 mL = 0.025 L.
<em>∴ no. of moles of HCl present in the flask at this time = MV</em> = (0.5 mol/L)(0.025 L) = <em>0.0125 mol.</em>
