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Vedmedyk [2.9K]
3 years ago
14

When 0.511 g of sodium metal is added to an excess of hydrochloric acid, 5310 J of heat are produced. What is the enthalpy of th

e reaction as written?
Physics
1 answer:
Mrac [35]3 years ago
7 0

Answer:

The the enthalpy of the reaction is 241.36 KJ.

Explanation:

Given that,

Weight of sodium = 0.511 g

We need to calculate the number of moles

Using formula of moles

moles=\dfrac{given\ mass}{molar\ mass}

moles=\dfrac{0.511}{23}

moles= 0.022

We need to calculate the energy in 1 mole

In 0.022 moles of sodium metal = 5310 J

In 1 moles of sodium metal =\dfrac{5310}{0.022}

The Energy in 1 moles of sodium is 241363.63 J.

Hence, The the enthalpy of the reaction is 241.36 KJ.

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A sample of copper has a volume of 23.4 cm3 if the density of copper is 8.9 gcm3 what is the coppers mass?
murzikaleks [220]
The answer is:  " 208 g " .
_____________________________________________
Explanation:
__________________________________________
The formula/ equation for density is:
__________________________________________
D = m / V  ;  That is,  "mass divided by volume" ;
 
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__________________________________________    
                   "mass per unit volume";  in which the "mass" is expressed in units of "g" ("grams") ;  and the "unit volume" is expressed in units of:
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           {Note the exact equivalent:  1 cm³ = 1 mL }.
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         →  The formula is:  " D = m / V "  ; 
___________________________________________
   in which:

     "D" refers to the "density" (see above), which is: "8.9 g/cm³ " (given); 

     "m" refers to the "mass" , in units of "g" (grams), which is unknown; and we want to find this value;
                 
     "V" refers to the "volume", in units of "cm³ " ;
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                 We want to find the mass, "m" ; so we take the original equation/formula for the density:
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             And we rearrange; to isolate "m" (mass) on ONE side of the    equation; and then we plug in our known/given values;
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    Multiply each side of the equation by "V" ; 
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