Answer:
m C2H5OH = 191.52 g
Explanation:
∴ %v/v C2H5OH = ( v C2H5OH / v sln)×100
⇒ 48 proof = (2) (%v/v C2H5OH)
⇒ 48/2 = %v/v C2H5OH
⇒ 24 = %v/v C2H5OH
⇒ 24/100 = v C2H5OH / v sln = 0.24
∴ v sln (gin) = 1.00 L
⇒ v C2H5OH = ( 0.24 )( 1.00 L )
⇒ v C2H5OH = 0.24 L = 240 mL
⇒ m C2H5OH = (240 mL)(0.798 g/mL)
⇒ m C2H5OH = 191.52 g
Option C: I and II only.
The atoms have subparticles and the isotops are atoms of the same element that differ in the number of neutrons.
Electron cloud is the region around the nucleus in an atom where we can locate an electron.
The concept of electron cloud model was introduced by the Schrodinger and Heisenberg. According to this model, it would be difficult to know the position of the electrons in an atom and they are not particles that orbit around the nucleus. We can only expect the electrons to be present in specific areas called the electron clouds around the nucleus. It is the quantum mechanical model that used the concept of electron clouds. According to the model, the electron cloud or an orbital is a space around the nucleus in an atom where the probability of finding an electron is 90%. It explains that electrons show wave nature. It is difficult to determine the exact position and momentum of an electron in an atom.
Coulomb's law mathematically is:
F = kQ₁Q₂/r²
we integrate this with respect to distance to obtain the expression for energy:
E = kQ₁Q₂/r; where k is the Coulomb's constant = 9 x 10⁹; Q are the charges, r is the seperation
Charge on proton = charge on electron = 1.6 x 10⁻¹⁹ C
E = (9 x 10⁹ x 1.6 x 10⁻¹⁹ x 1.6 x 10⁻¹⁹) / (185 x 10⁻¹²)
E = 1.24 x 10⁻¹⁸ Joules per proton/electron pair
Number of pairs in one mole = 6.02 x 10²³
Energy = 6.02 x 10²³ x 1.24 x 10⁻¹⁸
= 746.5 kJ
