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vovikov84 [41]
3 years ago
5

At the end of a reaction it is important to remove the solvent from a solid product (more than one answer may be correct):

Chemistry
1 answer:
vova2212 [387]3 years ago
7 0

Answer:

(B.) and (C.)

b. So that clean NMR spectra can be obtained that do not contain solvent peaks.

c. So that the yield can be determined.

Explanation:

The solvent used in Nuclear Magnetic Resonance (NMR) spectrometer is Trimethyl silane (TMS), a neutral solvent which doesn't give off any signals. Other solvents could have interactions with the radiation, and disrupt the spectra.

Furthermore, for accurate determination of the actual yield and overall percentage yield, solid must be separated from the solvent, dried and weighed.

I hope this was explanatory enough.

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5
ehidna [41]

Answer:

c

Explanation:

Molar mass of Na=23g/mol

amount of mole(n)=3

mass=?

therefore,n=m/M

3mol=m/23g/mol

m=23g/mol ×3mol

m=69g.

6 0
3 years ago
How do you convert ounces to grams
jok3333 [9.3K]
However many ounces you have, just multiply that by 28.34952. The answer to that is the conversion. so 5 ounces is 141.7476. Proof below.

4 0
3 years ago
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Look at the diagram of the solar system.
arlik [135]

Answer:

Retrograde Motion

Explanation:

Geocentric model of planets was proposed by Ptolemy. It stated that all sun, planets and stars revolve round the earth in circular orbits.

NOTE: Ptolemy: an ancient astronomer, geographer, and mathematician who considered the Earth the center of the universe (the "Ptolemaic system").

8 0
3 years ago
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The electron configuration of an element is 1s^2 2s^2 2p^6. Describe what most likely happens when an atom of this element comes
damaskus [11]

Answer & Explanation:

Using the numbers in the configuration 1s² 2s² 2p^6 3s^1, we can find out it has 11 electrons (by adding 2,2,6,1), meaning the element is sodium (Na). Sodium is in the outermost column of the periodic table, meaning it has one valence electron, making it highly reactive because it can very easily give one electron in a reaction. Atoms will prefer to have a full eight valence electrons, meaning an atom with seven valence electrons is also incredibly reactive since it only needs to gain one more in a reaction to gain eight. If sodium, an element with one valence electron, reacts with an element with seven (i.e chlorine), they both will be very quick to chemically bond to form a full valence shell. 

6 0
3 years ago
a) NaClO3 -> NaCl + O2------------------------DESCOMPOSICION b) HNO3 +Fe -> H2 + Fe (NO3)2------------SIMPLE SUSTITUCION c
docker41 [41]
A) <span>2 NaClO</span>₃<span>= 2 NaCl + 3 O</span>₂  ( <span>decomposition )

b) </span><span>2 HNO</span>₃ + Fe = H₂ + Fe(NO₃)₂ ( <span>single replacement )

c) 2 </span>Kl + Pb(NO₃)₂ -> Pbl₂ + 2 KNO₃ ( double replacement )

d) C + O₂ -> CO₂ ( synthesis )

e) Ca(HCO₃)₂ = CaCO₃ + CO₂ + H₂O ( <span>decomposition)

hope this helps!</span>
4 0
3 years ago
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