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3 years ago

Magnesium most common isotope

Chemistry

1 answer:

Citrus2011 [14]3 years ago

4 0

Magnesium has three stable isotopes, Mg-24, Mg-25, Mg-26. The most common isotope is Mg-24, which is 79% of all Mg found on Earth.

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How does a refracting telescope work?

Yakvenalex [24]

Answer:

Explanation:

because convex lenses bend light inward

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3 years ago

A 21.8 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter, according to the following reaction. If the temperature ris

Blababa [14]

Answer: The heat capacity of calorimeter is $15.66J/^oC$

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of ethanol = 21.8 g

Molar mass of ethanol = 46.07 g/mol

Putting values in above equation, we get:

$\text{Moles of ethanol}=\frac{21.8g}{46.07g/mol}=0.473mol$

To calculate the enthalpy change of the reaction, we use the equation:

$\Delta H_{rxn}=\frac{q}{n}$

where,

$q$ = amount of heat released = ?

n = number of moles = 0.473 moles

$\Delta H_{rxn}$ = enthalpy change of the reaction = -1235 kJ/mol = $-1235\times 10^3J/mol$ (Conversion factor: 1 kJ = 1000 J)

Putting values in above equation, we get:

$-1235\times 10^3J/mol=\frac{q}{0.473mol}\\\\q=(-1235\times 10^3J/mol\times 0.473mol)=-584.16\times 10^3J$

To calculate the heat capacity of calorimeter, we use the equation:

$q=c\Delta T$

where,

q = heat absorbed by the calorimeter = $584.16\times 10^3J$

c = heat capacity = ?

$\Delta T$ = change in temperature = $T_2-T_1=62.3^oC-25^oC=37.3^oC$

Putting values in above equation, we get:

$584.16\times 10^3J=c\times 37.3^oC\\\\c=\frac{584.16\times 10^3J}{37.3^oC}=15.66J/^oC$

Hence, the heat capacity of calorimeter is $15.66J/^oC$

4 0

4 years ago

Match each term with its definition. The position of an equilibrium always shifts in such a direction as to relieve a stress app

Lina20 [59]

Answer:

The position of an equilibrium always shifts in such a direction as to relieve a stress applied to the system. - Le Chatelier's principle

A molecule that donates a proton when it encounters a proton acceptor. - Bronsted-Lowry acid

Occurs when a reaction involving an acid and its conjugate base is combined with a second reaction involving a base and its conjugate acid. - Neutralization

It ionizes completely when dissolved in water. - Strong acid

The shift in the position of equilibrium caused by the addition of a participating ion. - Common ion effect

It only partially ionizes when dissolved in water. - Weak electrolyte

It is capable of acting as either an acid or a base depending upon the solute. - Amphoteric solvent

The act of self-ionization of a solvent to produce both a conjugate acid and a conjugate base. - autoprotolysis

A chemical species that bears both positive and negative charges. - zwitter ion

7 0

3 years ago

The enthalpy of formation of liquid ethanol (c2h5oh) is −277.6 kj/mol. what is the equation that represents the formation of liq

jeyben [28]

The enthalpy of formation has a negative sign, which means that the reaction is exothermic. In other words, when ethanol is formed, heat is released to the surroundings as a by-product. The reaction for the formation of ethanol is written below:

C₂H₄ + H₂O → C₂H₅OH

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3 years ago

Why does a short circuit occur?

Margarita [4]

Answer:

Current randomly flows around the circuitt

8 0

3 years ago

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