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
One way is too to collect just solute sugar, heat over very low heat to evaporate as much water as possible to give yourself a saturated solution. Then crystallize sugar and filter in the lab you'd wash with a suitable solvent and dry under vacuum To collect just the solvent water distill over moderate heat to collect water.
Inherited traits are traits that you are born with, they are in one's genes. Natural selection is the concept of "Survival of the Fittest" where only those who have the most beneficial of genetic traits survive to pass on their genetic code onto the next generation.
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There are 3 significant digits in 5.40.
(To help understand): Sig figs are just a way of simplifying a number.