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stiv31 [10]
3 years ago
7

1- Calcular la concentración molar de una solución de carbonato de sodio, Na2CO3, que contiene 10,6 g de esta sal en 1 L de solu

ción.
2- El contenido de cafeína en una taza de café de 125 mL es de 0,125 g. Calcule la concentración molar de esta solución, si la fórmula molecular de la cafeína es C8H10N4O2.

3- Una solución de MgCl2 se preparó al 29 %m/v, calcular la molaridad de la mezcla.

4- Determine la concentración molar y molal para una solución de HCl al 35 %m/m y densidad 1,18 g/mL.

5- ¿Cuál es la masa de Nitrato de potasio, KNO3 (MM = 101 g/mol), que está presente en 30 mL de solución 0,45 M?

6- ¿Cuál es la fracción molar de una solución que se prepara mezclando 10 g de metanol, CH4O y 27 g de agua?
Chemistry
1 answer:
Karo-lina-s [1.5K]3 years ago
5 0

Answer:

idk bc yo no hablo espanial

Explanation:

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An electric motor turns a belt that powers a pump. If this system is compared to the chemical reactions of the cell, which part
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The electricity on which the motor runs represents ATP.

ATP, adenosine triphosphate, is the energy currency of the cell. The energy released during the process of respiration is stored in the ATP molecule, and the ATP is stored within cells. Whenever the cell requires energy for any function, it simply hydrolyzes the ATP molecule, breaking a phosphate group off and releasing energy in the process.
7 0
3 years ago
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Rasheed calculates that his chemical reaction should produce 4 moles of product, but when he does the experiment, he gets only 3
Brut [27]

Answer:

The answer to your question is 75%

Explanation:

Data

Theoretical production = 4 moles

Experimental production = 3 moles

Percent yield = ?

Formula

Percent yield = \frac{Experimental production}{Theoretical production} x 100

Substitution

Percent yield = \frac{3}{4} x 100

Result

Percent yield = 75 %

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3 years ago
How many sodium atoms does 2NaOH have?
attashe74 [19]

Answer:

1

Explanation:

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Energy is the main cause of global conversation currents
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3 years ago
If 10.7 grams of NH4Cl is dissolved in enough water to make 800 mL of solution,what will be it's molarity
olga nikolaevna [1]
<h3><u>Answer;</u></h3>

Molarity = 0.25 M

<h3><u>Explanation;</u></h3>

Molarity is given by moles/Liter.

First we find moles:

Number of moles = Mass /molar mass

= (10.7g NH4Cl)/(53.5g/mol NH4Cl)

= 0.200 moles NH4Cl  

Then  we convert to liters:

= (800mL)*(1L/1000mL) = 0.800L  

Therefore; molarity = 0.2moles/0.8L

                                = 0.25M

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