<p> (1) 4 mol of <math><mrow><mo>=</mo><mn>4</mn><msub><mrow></mrow><mrow><mi>A</mi></mrow></msub></mrow></math> atoms</p><p> (2) 4 u of <math><mrow><mo>=</mo><mfrac><mrow><mn>4</mn><mi>u</mi></mrow><mrow><mn>4</mn><mi>u</mi></mrow></mfrac><mo>=</mo><mn>1</mn></mrow></math> atom</p><p> (3) 4 g of Helium <math><mrow><mo>=</mo><mfrac><mrow><mn>4</mn></mrow><mrow><mn>4</mn></mrow></mfrac></mrow></math> mole <math><mrow><mo>=</mo><mn>1</mn></mrow></math> mole <math><mrow><mo>=</mo><msub><mrow><mi>N</mi></mrow><mrow><mi>A</mi></mrow></msub></mrow></math> He atom</p><p> (4) <math><mrow><mn>2</mn><mo>.</mo><mn>2</mn><mn>7</mn><mn>1</mn><mn>0</mn><mn>9</mn><mn>8</mn><mn>2</mn></mrow></math> of He at STP <math><mrow><mo>=</mo><mfrac><mrow><mn>2</mn><mo>.</mo><mn>2</mn><mn>7</mn><mn>1</mn></mrow><mrow><mn>2</mn><mn>2</mn><mo>.</mo><mn>7</mn><mn>1</mn><mn>0</mn><mn>9</mn><mn>8</mn><mn>2</mn></mrow></mfrac></mrow></math> mole</p><p><math><mrow><mo>=</mo><mn>0</mn><mo>.</mo><mn>1</mn></mrow></math></p><p><math><mrow><mo>=</mo><mn>0</mn><mo>.</mo><mn>1</mn><msub><mrow></mrow><mrow><mi>A</mi></mrow></msub></mrow></math></p>
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