Chemistry, 20.07.2019 20:00, mayamcmillan11

817g of an unknowm gas occupies 1.25l at 27.0°c and a pressure of 765 mmhg. is the gas most likely methane(ch4), ethane(c2h6), propane(c3h8), or butane(c4h10)? show work.

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Use the equation pv=nrt

101991.60949Pa(0.00125m^3)=n(8.31)(300°K)
n=(101991.60949Pa*0.00125m^3)/(8.31*300°K)
n=0.0511moles

You have grams, which is .817, and you have moles. The next step is molar mass.

.817g/.0511moles=15.988g/mol

Now, calculate the molar mass of each gas.
CH4 = 16.043g/mol
C2H6 = 30.07g/mol
C3H8 = etc
C4H10 = etc

The closest answer is your CH4 (methane), so that is your answer. Hope this helps!

P.S. If you wouldn't mind, if you could mark this answer as so I can keep moving up levels! Thanks :)

answered: Guest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

answered: Guest

with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence

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817g of an unknowm gas occupies 1.25l at 27.0°c and a pressure of 765 mmhg. is the gas most likely m...