Answer:

Explanation:
Hello,
In this case, since you have both the final and initial volume for the titration procedure, clearly, the used volume is computed by the subtraction between them, since it accounts for the employed volume of the base, it turns out:

Best regards.
Scientists make hypothesis, or an educated guess. And they test there "guess" and see if there right or wrong. And they learn from there guess.
I hope this answer helped u
Answer is: the energy of exactly one photon of this light is 4.75·10⁻¹⁹ J.
Photon energy equation: E = h·ν.
E - energy of one photon.
ν- frequency.
h - Planck's constant.
ν = 7.17·10¹⁴ Hz.
h = 6.63·10⁻³⁴ J·s.
E = 6.63·10⁻³⁴ J·s · 7.17·10¹⁴ Hz.
E = 4.75·10⁻¹⁹ J.
the correct answers are:
1) The electron affinities of the elements in Group 17 are larger (more negative) than the elements in Group 1.
3) Elements in Group 14 have larger (more negative) electron affinities than elements in Group 15.
The orbitals are 1s, 2s, 2p, 3s, 3p, 3d, 4,s 4p, 4d, 4f, 5s, 5p, 5d, 5f, 6s, 6p, 6d, 7s, and 7p.
The one that doesn't exist is d) 1d.