How many seconds are there in one light-year?

Chemistry

1 answer:

I am Lyosha [343]3 years ago

8 0

31,536,000 seconds because 365 days a year, 24 hours a day. Every hour is 60 minutes, and each minutes 60 seconds. So to get the answer 60 sec/min x 60 min/hr x 24 hr/day x 365 days/year = 31,536,000 seconds.

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What is the difference between solution and solute

lana66690 [7]

A solution is a homogeneous mixture consisting of a solute dissolved into a solvent . The solute is the substance that is being dissolved, while the solvent is the dissolving medium. Solutions can be formed with many different types and forms of solutes and solvents.

8 0

3 years ago

Give the ground-state electron configuration for each of the following elements. After each atom is its atomic number in parenth

Anni [7]

Answer:

(a) ₁₉K: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

(b) ₁₀Ne: 1s² 2s² 2p⁶

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(a) 3

(b) 6

Explanation:

We can state the ground-state electron configuration for each element following Aufbau's principle.

(a) ₁₉K: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

(b) ₁₀Ne: 1s² 2s² 2p⁶

Second part

(a) Al belongs to Group 13 in the Periodic Table. It has 13-10=3 electrons in the valence shell.

(b) O belongs to Group 16 in the Periodic Table. It has 16-10=6 electrons in the valence shell.

3 0

3 years ago

Concentration required to begin precipitate pbcl2 for pbcl2 ksp=1. 17×10−5

Ne4ueva [31]

The concentration required to begin to precipitate PbCl2 for PbCl2 is 0.0216 M.

<h3>What is molarity?</h3>

Molarity is the measure of the concentration of any solute in per unit volume of the solution.

The reaction is $\rm Pb^2^+(aq) + 2Cl^-(aq) \rightarrow PbCl_2(s).$

The molarity of lead is 0.025 M

The ksp is given 17×10⁻⁵

Now, calculating the concentration

$[Pb^2^+] = 0.025 M.\\Ksp = 1.17 \times 10^-^5\\Ksp = [Pb^2^+] \times [Cl^-]^2\\[Cl^-] = \dfrac{\sqrt{ Ksp}}{[Pb^2^+]} \\\\[Cl^-] = \dfrac{\sqrt{ 0.0000117}}{0.025} \\[Cl^-] = 2.16 \times 10^-^2M.$