Answer:
5.18.
Explanation:
<em>∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.
</em>
[OH⁻] = 1.5 x 10⁻⁹ M.
∴ [H₃O⁺] = 10⁻¹⁴/[OH⁻] = 10⁻¹⁴/(1.5 x 10⁻⁹ M) = 6.66 × 10⁻⁶ M.
∵ pH = - log[H₃O⁺]
<em>∴ pH = - log(6.66 × 10⁻⁶ M) = 5.176 ≅ 5.18.</em>
So we know that this amount of atoms is Avogadro's number - the number of atoms in 1 mole of a substance.
So then, using dimensional analysis, we can find the mass, in grams, of potassium.
First we must find the molar weight of potassium as found on the periodic table: 39.098g/mol
Then we can solve directly for mass:
Therefore, the amount of atoms you have given, in terms of mass, will equal 39.098g - if the answer requires significant figures, then the mass would be 39.1g of potassium.
No it is a organic molecule.
The answer is (3) An electron in the third shell has more energy than an electron in the second shell. The energy of electron will increase when number of shell increase.
Prograde or direct motion, in astronomy, a type of astronomical bodies