Protons, neutrons, and electrons.

What is the most stable monatomic ion formed from lithium?

s344n2d4d5 [400]

Answer: The ion formed by lithium element is $Li^+$

Explanation:

Ions are formed when an atom looses or gains electrons.

If an atom gains electrons, it leads to the formation of negative ions known as anions. For Example: Fluorine gains 1 electron to form $F^-$ ions.

If an atom looses electrons, it leads to the formation of positive ions known as cations. For Example: Sodium looses 1 electron to form $Na^+$ ions.

Lithium is the 3rd element of the periodic table having 3 electrons.

The electronic configuration of lithium element = $1s^22s^1$

This element will loose 1 electron to attain stable electronic configuration and will lead to the formation of $Li^+$ ion.

Hence, the ion formed by lithium element is $Li^+$

3 0

3 years ago

A solution is prepared by mixing 769 mL of ethanol with 507 mL of water. The molarity of ethanol in the resulting solution is 10

blsea [12.9K]

Answer:

57 mL

Explanation:

To make things clear, when 769 mL of ethanol were mixed with 507 mL of water, the resulting volume was not (769+507) 1276 mL, but a lower value. This is because of the interactions between liquid molecules.

First we calculate how many grams of ethanol are there in 769 mL, using the given density:

mass = density * volume

0.7893 g/mL * 769 mL = 606.97 g ethanol

Then we convert 606.97 g of ethanol into moles, using its molar mass:

606.97 g ÷ 46.07 g/mol = 13.17 mol

Now we calculate the actual volume of the solution, using the definition of molarity:

Volume = Moles / Molarity

13.17 mol / 10.8 M = 1.219 L

Finally we convert 1.219 L to mL, and calculate the difference in volume:

1.219 L * 1000 = 1219 mL

1276 mL - 1219 mL = 57 mL

4 0

3 years ago

Mg(s)|Mg^ 2+ (aq)||Ag^ + (aq)|Ag(s)

Korolek [52]

Answer:

Where is the graph or picture to help me figure out what its talkin about

Explanation:

4 0

3 years ago

how many moles of oxygen gas (o2) are required to react with 3.75 moles of ammonia (nh3) in the reaction 4nh3 + 5o2 → 4no + 6h2o

kari74 [83]

4 NH₃ + 5 O2 = 4NO + 6 H₂O

4 moles NH₃ ---------> 5 moles O₂
3.75 mols NH₃ -------> ?

Moles O₂ = 3.75 x 5 / 4

Moles O₂ = 18.75 / 4

= 4.6875 moles of O₂

hope this helps!

7 0

3 years ago

The table shows a chemical equation and the dimensional analysis used by a student to calculate the number of moles of Ba3N2 req

UNO [17]

This problem is providing the chemical reaction whereby barium nitride reacts with water to produce barium hydroxide and ammonia, so the number of moles of barium nitride are required in order to produce 8.3 moles of ammonia. It asks for us to evaluate the student's setup, so we conclude the answer is C. "1 mol of NH3 should be replaced with 2 mol of NH3", according to:

<h3>Mole ratios:</h3>

In chemistry, stoichiometric calculations are used to figure out the moles or mass of a substance, given information about another one in the reaction. In this case, for the given chemical equation:

$Ba_3N_2 + 6H_2O \rightarrow 3Ba(OH)_2 + 2NH_3$

We evidence a 1:2 mole ratio of barium nitride to ammonia, for that reason, the student's setup:

$8.3 mol NH_3 * \frac{1 mol Ba_3N_2 }{1 mol NH_3}$

Is incorrect, because the ammonia must be accompanied by a 2 rather than the 1 it is given there:

$8.3 mol NH_3 * \frac{1 mol Ba_3N_2 }{2mol NH_3}$

Thereby, the correct answer is C. "1 mol of NH3 should be replaced with 2 mol of NH3"

Learn more about mole ratios: brainly.com/question/15288923

5 0

3 years ago