Answer:
It will be C.
Explanation: If you read all of the other choices closely they don't make sense in context. (Option A) wouldn't make sense because removing things that could be reused would be inefficient to the body (and waste can't typically be reused in the human body). (Option B) growing too tall isn't particularly healthy or helpful, but it's not exactly life threatening either. And the very last choice is just nonsense period.
2,8,1
It's in group 1, so its outershell only has 1 electron, and the other shells are completely filled, so 2 then 8. :)
Answer:
![m_{CaO}=0.0174gCaO](https://tex.z-dn.net/?f=m_%7BCaO%7D%3D0.0174gCaO)
Explanation:
Hello,
In this case, the undergoing reaction is:
![CaCO_3(s)\rightleftharpoons CaO(s)+CO_2(g)](https://tex.z-dn.net/?f=CaCO_3%28s%29%5Crightleftharpoons%20CaO%28s%29%2BCO_2%28g%29)
Thus, since the Kp is given, it equals the partial pressure of carbon dioxide since the equilibrium expression only consider the gaseous species, hence:
![Kp=p_{CO_2}^{eq}=3.9x10^{-2}atm](https://tex.z-dn.net/?f=Kp%3Dp_%7BCO_2%7D%5E%7Beq%7D%3D3.9x10%5E%7B-2%7Datm)
Therefore, by considering the given pressure and temperature, one computes the moles of carbon dioxide:
![n_{CO_2}=\frac{p_{CO_2}V}{RT} =\frac{3.9x10^{-2}atm*0.654L}{0.082\frac{atm*L}{mol*K} *1000K}=3.11x10^{-4}molCO_2](https://tex.z-dn.net/?f=n_%7BCO_2%7D%3D%5Cfrac%7Bp_%7BCO_2%7DV%7D%7BRT%7D%20%3D%5Cfrac%7B3.9x10%5E%7B-2%7Datm%2A0.654L%7D%7B0.082%5Cfrac%7Batm%2AL%7D%7Bmol%2AK%7D%20%2A1000K%7D%3D3.11x10%5E%7B-4%7DmolCO_2)
In such a way, carbon dioxide and calcium oxide have a 1-to-1 molar relationship, thereby, the mass of calcium oxide turns out:
![m_{CaO}=3.11x10^{-4}molCO_2*\frac{1molCaO}{1molCO_2}*\frac{56.1gCaO}{1molCaO} \\m_{CaO}=0.0174gCaO](https://tex.z-dn.net/?f=m_%7BCaO%7D%3D3.11x10%5E%7B-4%7DmolCO_2%2A%5Cfrac%7B1molCaO%7D%7B1molCO_2%7D%2A%5Cfrac%7B56.1gCaO%7D%7B1molCaO%7D%20%20%5C%5Cm_%7BCaO%7D%3D0.0174gCaO)
Best regards.
I’m assuming this is a true and false question. The answer is true. Phosphorus has a larger atomic mass. Phosphorus is number 15 on the periodic table. Phosphorus is a non-metal.