Answer:
pH = 6.5
Explanation:
pH is the negative log of the hydronium concentration, [H⁺]. Since we are given the concentration, we can just plug it in the following equation:
pH = -log[H⁺] = -log[3.5 x 10^-7 M] = 6.5
Answer:
0.807 moles
Explanation:
No of molecules = No of mole × Avogadro's number
No of mole = No of molecules / Avogadro's number
No of mole = 5.24×10^23/6.02×10^23
0.870 moles
<span>The s sublevel has just one orbital, so can contain 2 electrons max. The p sublevel has 3 orbitals, so can contain 6 electrons max. The d sublevel has 5 orbitals, so can contain 10 electrons max. And the 4 sublevel has 7 orbitals, so can contain 14 electrons max.
So, having this in mind, 10 electrons in total can be contained in the 4d sublevel.
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Based on the mass given, the value of P in the N - P - K designation is 32.
<h3>What is percentage mass composition of an element?</h3>
The percentage mass composition of an element is the mass percent ofbthe element in the the total mass of the compound.
Since the fertilizer contains 1.2 g of phosphorus as P2O5.
Molar mass of P2O5 = 142 g
mass percent of P in P2O5 = 2 × 31/142 = 43.6%
mass of P2O5 in 8.6 g fertilizer = 100/43.6 × 1.2 = 2.75 g
Mass percent of P2O5 = 2.75/8.6 × 100% = 32.0%
Therefore, the value of P in the N - P - K designation is 32.
Learn more about percentage mass at: brainly.com/question/26150306
They react to form salt ZnCl + hydrogen gas