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<p>[QUOTE=&quot;Joe kool, post: 3600964, member: 99719&quot;]A copper penny has a mass of 2.60 g. Assuming pure copper, how much of this mass is contributed by</p><p><br /></p><p>(a) the neutrons in the copper nuclei and (b)electrons?</p><p><br /></p><p>Step-by-step solution:</p><ul> <li>Step 1 of 5<br /> (a) The atomic weight of Cu = 63.55 g/mol<br /> <br /> One ‘Cu’ atom contains 29 protons and 29 electrons.<br /> <br /> 63.55g or 1 mole of Cu contains <img src="https://word-to-html-images.s3.amazonaws.com/9780136012603/690-2-9p-i1.png" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /><br /> <br /> Number of atoms in 2.60g of Cu = <img src="https://word-to-html-images.s3.amazonaws.com/9780136012603/690-2-9p-i2.png" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /><br /> <br /> <img src="https://word-to-html-images.s3.amazonaws.com/9780136012603/690-2-9p-i3.png" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /><br /> <br /> So, 2.60g of Cu contains <img src="https://word-to-html-images.s3.amazonaws.com/9780136012603/690-2-9p-i4.png" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /><br /> <br /> <img src="https://word-to-html-images.s3.amazonaws.com/9780136012603/690-2-9p-i5.png" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />and protons<br /> <br /> The mass of one electron <img src="https://word-to-html-images.s3.amazonaws.com/9780136012603/690-2-9p-i6.png" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /><br /> <br /> So, mass of total electrons = <img src="https://word-to-html-images.s3.amazonaws.com/9780136012603/690-2-9p-i7.png" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /><img src="https://word-to-html-images.s3.amazonaws.com/9780136012603/690-2-9p-i8.png" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /><br /> <br /> <img src="https://word-to-html-images.s3.amazonaws.com/9780136012603/690-2-9p-i9.png" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /><br /> </li> </ul><p>[/QUOTE]</p><p><br /></p>

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