Answer: mole fraction of methanol = 0.590
mole fraction of ethanol = 0.410
Explanation:
We are given:
Equal masses of methanol
and ethanol
are mixed.
let the mass be x g.
Calculating the moles of methanol in the solution, by using the equation:
![\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{xg}{32.04g/mol}](https://tex.z-dn.net/?f=%5Ctext%7BNumber%20of%20moles%7D%3D%5Cfrac%7B%5Ctext%7BGiven%20mass%7D%7D%7B%5Ctext%7BMolar%20mass%7D%7D%3D%5Cfrac%7Bxg%7D%7B32.04g%2Fmol%7D)
Calculating the moles of ethanol in the solution, by using the equation:
![\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{xg}{46.07g/mol}](https://tex.z-dn.net/?f=%5Ctext%7BNumber%20of%20moles%7D%3D%5Cfrac%7B%5Ctext%7BGiven%20mass%7D%7D%7B%5Ctext%7BMolar%20mass%7D%7D%3D%5Cfrac%7Bxg%7D%7B46.07g%2Fmol%7D)
To calculate the mole fraction of methanol, we use the equation:
![\chi_{methanol}=\frac{n_{methanol}}{n_{methaol}+n_{ethanol}}](https://tex.z-dn.net/?f=%5Cchi_%7Bmethanol%7D%3D%5Cfrac%7Bn_%7Bmethanol%7D%7D%7Bn_%7Bmethaol%7D%2Bn_%7Bethanol%7D%7D)
![\chi_{methanol}=\frac{\frac{xg}{32.04g/mol}}{\frac{xg}{32.04g/mol}+\frac{xg}{46.07g/mol}}=0.590](https://tex.z-dn.net/?f=%5Cchi_%7Bmethanol%7D%3D%5Cfrac%7B%5Cfrac%7Bxg%7D%7B32.04g%2Fmol%7D%7D%7B%5Cfrac%7Bxg%7D%7B32.04g%2Fmol%7D%2B%5Cfrac%7Bxg%7D%7B46.07g%2Fmol%7D%7D%3D0.590)
To calculate the mole fraction of ethanol, we use the equation:
![\chi_{ethanol}=\frac{n_{ethanol}}{n_{methaol}+n_{ethanol}}](https://tex.z-dn.net/?f=%5Cchi_%7Bethanol%7D%3D%5Cfrac%7Bn_%7Bethanol%7D%7D%7Bn_%7Bmethaol%7D%2Bn_%7Bethanol%7D%7D)
![\chi_{ethanol}=\frac{\frac{xg}{46.07g/mol}}{\frac{xg}{32.04g/mol}+\frac{xg}{46.07g/mol}}=0.410](https://tex.z-dn.net/?f=%5Cchi_%7Bethanol%7D%3D%5Cfrac%7B%5Cfrac%7Bxg%7D%7B46.07g%2Fmol%7D%7D%7B%5Cfrac%7Bxg%7D%7B32.04g%2Fmol%7D%2B%5Cfrac%7Bxg%7D%7B46.07g%2Fmol%7D%7D%3D0.410)
Thus mole fraction of methanol is 0.590 and mole fraction of ethanol 0.410 in three significant figures.
The answer is C because of the ionization energy trend
<span>A small proportion of helium in the crust is helium that was trapped in the Earth when the Earth formed and has not yet escaped. Most helium on Earth, however, forms as a result of alpha decay of uranium and thorium. The emitted alpha particles, once they grab a couple of stray electrons, become helium atoms and can accumulate in gas reservoirs along with things such as methane.</span>
A(n) Acute exposure is a short term or brief exposure that may create an immediate health hazard. Answer: A)
Atoms arent indivisible. Atoms consist of protons, electrons, neutrons, & quarks & a whole bunch of subatomic particles.