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yanalaym [24]
2 years ago
13

Write the electron configuration of the element that has Z = 3 *

Chemistry
1 answer:
Natasha2012 [34]2 years ago
8 0

Answer:

1s²2s^1

Explanation:

Lithium Z = 3

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What is the molecular formula of a compound given the molar mass of the compound is 62.18 g/mol and the empirical formula is c2h
Mariulka [41]
To get the molecular formula we use the individual atomic masses of the atoms making the molecule. Hence, to get the factor by which the empirical formula is multiplied, we divide molar mass by the total of the mass of the atoms making the empirical formula.
(C2H7) the mass of one carbon atoms is 12 so two atoms add up to 24. The mass of one hydrogen atom is 1 a.m.u thus 7 atoms give a total of 7 a.m.u. The sum of the two types of atoms is 24+7= 31
Molar mass=62.18
62.18/31=2.0
Hence, (C2H7) 2=C4H14
5 0
3 years ago
What do March 21st and September 21st have in common?
pogonyaev

Answer:

The equinoxes are the only time when both the Northern and Southern Hemispheres experience roughly equal amounts of daytime and nighttime. On Earth, there are two equinoxes every year: one around March 21 and another around September 22.

Explanation:

5 0
3 years ago
A solution of pyridinium bromide has a pH of 3.00. What is the concentration of the pyridinium cation at equilibrium, in units o
Artemon [7]

Answer:

The concentration of the pyridinium cation at equilibrium is 1.00×10⁻³ M

Explanation:

In water we have

C₅H₅NHBr + H₂O ⇒ C₅H₅NH+ + Br−

Pyridinium Bromide (C₅H₅NHBr) Dissociates Completely  Into C₅H₅NH+ And Br− as such it is a strong Electrolyte.

Therefore the number of moles of positive ion produced per mole of C₅H₅NHBr  is one

pH = - log [H₃O⁺] Therefore 10^-pH = [H₃O⁺] = concentration of C₅H₅NHBr

= 10⁻³ = 0.001M = concentration of C₅H₅NHBr

The concentration of C₅H₅NHBr is = 1.00×10⁻³ M to two places of decimal

4 0
3 years ago
Compounds have two or more
frozen [14]

Answer: B

Explanation:

6 0
3 years ago
Corals absorb ______ from the ocean to form their skeletons.
Nina [5.8K]
<span>They absorb calcium ions and bicarbonate (hydrogen carbonate) ions.
Sooo B
I hope this helps! :)
</span>
3 0
3 years ago
Read 2 more answers
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