To answe this question, we will assume that the percentage abundance of 14n is y. Since the percentage abundance of 14n + percentage abundance of 15n = 100% = 1 Therefore, percentage abundance of 15n = 1 - y.
Now we know that the average atomic mass of nitrogen is 14.0067 Therefore: average atomic mass of nitrogen = atomic mass of 14n x its percentage abundance + atomic mass of 14n x its percentage abundance 14.0067 = 14.003074002 y + <span>15.00010897 (1 - y) </span>14.0067 = 14.003074002 y + 15.00010897 - 15.00010897 y 14.0067 - 15.00010897 = 14.003074002 y - 15.00010897 y <span>0.99703497 y = 0.99340897 </span> Therefore y = <span> 0.99636
Based on this, the percentage abundance of 14n is </span> 0.99636x100= <span>99.636% while percentage abundance of 15n = 100% - </span>99.636% = <span>0.364%</span>
NO₂ is a brown gas while N₂O₄ is colorless. If heating causes a brown color to persist, then this means that heating causes the reaction to shift backwards and produce NO₂. Therefore, the reaction must be exothermic.
Answer is: line be long 3,011·10¹³ kilometers. diametar of virus = 5·10⁻⁶ cm ÷ 100000 = 5·10⁻¹¹ km. line lenght = 5·10⁻¹¹ km · 6,023·10²³. line lenght = 3,011·10¹³ km. Avogadro number = 6,023·10²³. 1 cm = 10⁻² m = 10⁻⁵ km.
