Answer:
Protons = 11
Electrons = 10
Neutrons = 12
Explanation:
The atomic number of an element is the number of protons present in the nucleus of an atom of that element. A neutral atom of an element contains equal number of protons and electrons, therefore, the atomic number is also the electron number for a neutral atom.
The mass number is the sum of proton and neutrons in the nucleus of an atom of an element.
The atomic number of sodium-23, Na-23 is 11 while the mass number is 23.
An atom of sodium that has a net charge of +1 has lost an electron. Therefore, from the above information, the number of protons, neutrons and electrons present in this atom of sodium-23 is as follows:
Protons = 11
Electrons = 11 - 1
Electrons = 10
Neutrons = 23 - 11
Neutrons = 12
Answer:
2.13L
Explanation:
first you must find the amount(mols) of HCl in the solution. then you can use that to find the volume of the solution.
we know the:
mass m = 9.35g
molar mass M = 1 + 35.5=36.5 g/mol ( <em><u>check</u></em><em><u> </u></em><em><u>pe</u></em><em><u>riodic</u></em><em><u> </u></em><em><u>table</u></em><em><u> </u></em>)
concentration c = 0.120 mol/L
amount ( mols) of HCl:
n= m/M
n(HCl) = 9.35/36.5
= 0.2561644 mol
concentration of HCl in solution:
n= cV
V(HCl) = n/c
= 0.2561644/0.120
= 2.1347
= 2.13 L (<em>3sf</em><em>)</em><em> </em>
Remember that a conjugate acid-base pair will differ only by one proton.
None of the options you listed are conjugate acid-base pairs as none of them differ only by one proton (or H⁺)
An example of a conjugate acid-base pair would be NH₃ and NH₄⁺NH₃ + H₂O --> NH₄⁺ + OH⁻NH3 is the base, and NH₄⁺ is the conjugate acid
The answer is A but i'm not sure .