Toluene, c6h5ch3, is a liquid compound similar to benzene, c6h6. it is the starting material for other substances, including tri
2 answers:
Answer:
3.08 m
Explanation:
To calculate the molarity, you have to use the following formula:
From the question, we already have the mass of the solvent (benzene); However, for the calculation of molality, we require the solvent in Kg, therefore we do the conversion from g to kg:
125 g of benzene = 0.125 kg of benzene.
To obtain the number of moles of solute we have to use the molecular weight of toluene, which is 92.14
To convert from g to moles, we divide the grams of toluene by the molecular weight:
Therefore, we have 0.386 moles of toluene.
The last step will be to replace all the values in the molality formula:
= 3.08 m
I hope this clarifies your inquiry.
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Number of electrons in a Ca²⁺ = 18
<h3>Further explanation </h3>In an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is
• s: 2 electrons
• p: 6 electrons
• d: 10 electrons and
• f: 14 electrons
Charging electrons in the sub shell uses the following sequence:
<em>1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc. </em>
The element Ca has an atomic number of 20, so the number of electrons and protons (in neutral atoms) is also 20
Electron configuration of Ca : <em>1s², 2s², 2p⁶, 3s², 3p⁶, 4s² ⇒[Ar] 4s²</em>
When Ca releases 2 electrons to gain stability (forming Ca²⁺ cations), the number of electrons becomes:
and the electron configuration (Ca²⁺ ) becomes:
<em>1s², 2s², 2p⁶, 3s², 3p⁶</em>
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