Molality=mol/kg
342/171
=2m
Hope this helped :)
Answer:
Option-B (Carbon and Silicon)
Explanation:
Among the given pairs only carbon and silicon have the most similar properties. This is because,
Sodium and Magnesium belong to different groups. Sodium present in Group I has one electron in its valence shell and capable of transferring only one electron while, Magnesium present in Group II have two electrons in its valence shell and is capable of donating two electrons. Hence, both show different properties.
Example:
2 Na + Cl₂ → NaCl
Mg + Cl₂ → MgCl₂
As shown in reactions when Sodium and Magnesium are treated with Cl₂ they give a products with different proportions.
Carbon and Silicon show almost same properties because both belong to Group IV hence both are capable of forming four bonds. Also, they share the same property of self linkage in making a long chains.
Argon and Chlorine also belong to two different groups. Argon is present in Group VIII (Noble Gases) and Chlorine is present in Group VII (Halogens). Hence, Argon is an inert specie which is non reactive while Chlorine gives different reaction easily.
Potassium and Calcium belong to different groups. Potassium present in Group I has one electron in its valence shell and capable of transferring only one electron while, Calcium present in Group II have two electrons in its valence shell and is capable of donating two electrons. Hence, both show different properties.
Example:
2 K + Cl₂ → KCl
Ca + Cl₂ → CaCl₂
As shown in reactions when Potassium and Calcium are treated with Cl₂ they give a products with different proportions.
It is harder to remove an electron from fluorine than from carbon because the size of the nuclear charge in fluorine is larger than that of carbon.
The energy required to remove an electron from an atom is called ionization energy.
The ionization energy largely depends on the size of the nuclear charge. The larger the size of the nuclear charge, the higher the ionization energy because it will be more difficult to remove an electron from the atom owing to increased electrostatic attraction between the nucleus and orbital electrons.
Since fluorine has a higher size of the nuclear charge than carbon. More energy is required to remove an electron from fluorine than from carbon leading to the observation that; it is harder to remove an electron from fluorine than from carbon.
Learn more: brainly.com/question/16243729
Answer:
mountains-a large natural elevation of the earth's surface rising abruptly from the surrounding level; a large steep hill.
Explanation:
Answer:
There are two questions here;
1. How many moles of tungsten atoms are there in 9.6*10^25 atoms of bromine?
This question is invalid as it is quite impossible to obtain the number of moles of tungsten atoms in another element, bromine. The question would have been written as the number of moles of tungsten atoms in 9.6*10^25 atoms of tungsten or bromine as the case may be.
To solve for the number of moles of an atom; we should recur that
I mole of an atom = 6.02*10^23 atoms
6.02*10^23 atoms = 1 mole
9.6*10^25 atoms = (9.6 *10^25 / 6.02*10^23) moles
= 1.595 *10^2 moles
2. The reaction of 9 moles of O2 will produce -------- moles of H2O in the combustion reaction of propane.
C3H8 + 5O2 -------> 3CO2 + 4H2O
5 moles of O2 produces 4 moles of H2O
9 moles of O2 will produce (9 * 4/ 5) moles of H2O
= 7.2 moles of H2O
9moles of O2 will produce 7.2 moles of H2O.
