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Dafna1 [17]
4 years ago
10

What was one main point of Dalton’s atomic theory?

Chemistry
1 answer:
Cerrena [4.2K]4 years ago
8 0
The answer to this question is C, I hope this helps you!
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disolvemos 25 g de hidroxido de sodio en agua hasta obtener 500 cm3 de disolucion. ¿Cual es la concentracion molar de la disoluc
LiRa [457]

Answer:

M=1.25M

Explanation:

Hola,

Dado que la molaridad de una solución es definida en términos de las moles de soluto y el volumen de la solución en litros:

M=\frac{n}{V}

Primero debemos calcular las moles de hidróxido de sodio, teniendo en cuenta que su masa molar es de 40 g/mol:

n=25gNaOH*\frac{1molNaOH}{40gNaOH}=0.625mol

Luego, el volumen el litros:

V=500cm^3*\frac{1L}{1000cm^3} =0.500L

Así, calculamos la concentración molar de la solución:

M=\frac{0.625mol}{0.500L}\\ \\M=1.25M

Saludos!

3 0
3 years ago
Read 2 more answers
Calculate the ph of a 0.25M solution of monochloroacetic acid at 25 c
Phoenix [80]
<h3>Answer: <em>pH=2.25 </em></h3>

Explanation:

monochloroacetic acid  also means: chloroacetic acid

pKa of monochloroacetic acid= 1.4 x 10^-3  (I believe this should have been given in the problem or perhaps in the textbook)

Formula: pH= pKa + log ( some number in M)

pH= -log (1.4 x 10^-3) + log (0.25M)= 2.85 + -0.602= 2.25

pH= 2.25  

8 0
3 years ago
¿por qué la química es considerada una ciencia natural?​
cricket20 [7]
A la química a veces se le llama "la ciencia central", porque une la física con otras ciencias naturales, como la geología y la biología. La química es el estudio de la materia y sus propiedades.




Mi mala si esto no ayuda
8 0
3 years ago
Something <br> occurs when a liquid changes to a gas below its surface as well as on the surface
insens350 [35]
What exactly are you asking?

6 0
4 years ago
What is the mass of 4.85 X 10^22 atoms of iron (Fe)?
ludmilkaskok [199]

Answer:

Mass = 4.5 g

Explanation:

Given data:

Number of atoms of iron = 4.85 ×10²² atoms

Mass of iron = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

4.85 × 10²² atoms of iron / 6.022 × 10²³ atoms × 1 mol

0.081 mol

Mass of iron:

Mass = number of moles × molar mass

Mass =  0.081 mol × 55.85 g/mol

Mass = 4.5 g

8 0
3 years ago
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