They can distill the muddy water. This can be done by placing it in a can, covered with pipes to collect the boiling water, and then collecting the distillate. The fuel will be used to provide energy for distillation and the solid particles in from the muddy water will remain in the can as residue.
![H_2O](https://tex.z-dn.net/?f=H_2O)
so:
![\frac{50}{200+50}+100\%= \frac{50*100}{250}\%=20\%](https://tex.z-dn.net/?f=%20%5Cfrac%7B50%7D%7B200%2B50%7D%2B100%5C%25%3D%20%5Cfrac%7B50%2A100%7D%7B250%7D%5C%25%3D20%5C%25)
![MW of acid = 2*C+4*H+2*O = 2*12+4*1+2*16=](https://tex.z-dn.net/?f=MW%20of%20acid%20%3D%202%2AC%2B4%2AH%2B2%2AO%20%3D%202%2A12%2B4%2A1%2B2%2A16%3D)
![=24+4+32=60g/mol](https://tex.z-dn.net/?f=%3D24%2B4%2B32%3D60g%2Fmol)
so:
![\frac{50g}{60g/mol}\approx0.83moles](https://tex.z-dn.net/?f=%5Cfrac%7B50g%7D%7B60g%2Fmol%7D%5Capprox0.83moles)
it means that
in
![50g](https://tex.z-dn.net/?f=50g)
of acid there is
![\approx0.83](https://tex.z-dn.net/?f=%5Capprox0.83)
moles of acid
![MW of H_2O = 2*H+O=2*1+16=2+16=18g/mol](https://tex.z-dn.net/?f=MW%20of%20H_2O%20%3D%202%2AH%2BO%3D2%2A1%2B16%3D2%2B16%3D18g%2Fmol)
so:
![\frac{200g}{18g/mol}\approx11.11moles](https://tex.z-dn.net/?f=%5Cfrac%7B200g%7D%7B18g%2Fmol%7D%5Capprox11.11moles)
it means that:
in
![200g](https://tex.z-dn.net/?f=200g)
of water there is
![\approx11.11](https://tex.z-dn.net/?f=%5Capprox11.11)
moles of water
therefore:
![\frac{0.83mol}{11.11mol+0.83mol}= \frac{0.83mol}{11.94mol}=0.069](https://tex.z-dn.net/?f=%20%5Cfrac%7B0.83mol%7D%7B11.11mol%2B0.83mol%7D%3D%20%5Cfrac%7B0.83mol%7D%7B11.94mol%7D%3D0.069)
So your answers are:
![20\%](https://tex.z-dn.net/?f=20%5C%25)
and the mole fraction is:
It takes <u><em>about a month</em></u> for the Moon to complete one revolution around the earth. It is much longer than 60 hours and much shorter than 365 days. <u><em>So the correct answer is C. 29.5 days. I think you made a typo, because the correct answer is 29.5 days not years.</em></u>
Answer:
Element A is pottassium an alkali metal
Element B is a noble gas
Element C is bromine I think which is a halogen
Element D is lithium I think...or some other from group 2 or 1