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Norma-Jean [14]
3 years ago
10

Tin has many possible isotopes. three of these isotopes are 115sn, 117sn, and 126sn. what is the mass number of each? how many p

rotons, neutrons, and electrons are present in each?
Chemistry
1 answer:
Sunny_sXe [5.5K]3 years ago
6 0
Isotopes of an atom is the same atom but the difference between them is that the number of neutrons in the nucleus would differ, depending on the mass number. So let's take a look at your problem and breakdown Tin.

A stable atom of Tin (Sn):
Atomic number: 50
Protons: 50
Electrons:50
Neutrons: 69
Mass Number: 119 (rounded-off)

The Mass number is equal to the sum of protons and neutrons.
Now in an isotope, everything is the same, except for the number of neutrons. We can solve for how many neutrons an isotope has base on the mass number. 

A = p + n
Where A= Mass number
            p = proton
            n = neutron

To get the number of neutron just get the difference between the mass number and proton.
n = A - p

For your given, the mass number is already indicated.

*Note that isotopes have the same number of electrons, protons and atomic number as the original atom. 
 
1. 115 Sn or Tin 115 
Atomic number: 50 
Protons:    50
Electrons: 50 
Neutrons: ?
Mass number: 115

Now we get the number of neutrons:

n = A - p
n = 115 - 50
n  = 65

So 115Sn has a mass number of 115, 50 protons, 50 electrons and 65 neutrons.

2. 117 Sn or Tin-117
Atomic number: 50 
Protons:    50
Electrons: 50 
Neutrons: ?
Mass number: 117

Now we get the number of neutrons:

n = A - p
n = 117 - 50
n  = 67

So 117Sn has a mass number of 117, 50 protons, 50 electrons and 67 neutrons.

3. 126 Sn or Tin-126
Atomic number: 50 
Protons:    50
Electrons: 50 
Neutrons: ?
Mass number: 126

Now we get the number of neutrons:

n = A - p
n = 126 - 50
n  = 76

So 126Sn has a mass number of 126, 50 protons, 50 electrons and 76 neutrons.
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Answer:

La masa atómica del hierro es 55.847 gramos por mol.

Explanation:

Las masas molares de Fe_{54}, Fe_{56}, Fe_{57} y Fe_{58} son 53.940 gramos por mol, 55.935 gramos por mol, 56.935 gramos por mol y 57.933 gramos por mol, respectivamente. La masa atómica del hierro se determina mediante el siguiente promedio ponderado:

M_{Fe} = \frac{5.82}{100}\times \left(53.940\,\frac{g}{mol} \right)+\frac{91.66}{100}\times (55.935\,\frac{g}{mol})+\frac{2.19}{100}\times \left(56.935\,\frac{g}{mol} \right)+\frac{0.33}{100}\times \left(57.933\,\frac{g}{mol} \right)

M_{Fe} = 55.847\,\frac{g}{mol}

La masa atómica del hierro es 55.847 gramos por mol.

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3 years ago
Calculate the standard enthalpy change for the reaction at 25 ∘ 25 ∘ C. Standard enthalpy of formation values can be found in th
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<u>Answer:</u> The standard enthalpy change of the reaction is coming out to be -16.3 kJ

<u>Explanation:</u>

Enthalpy change is defined as the difference in enthalpies of all the product and the reactants each multiplied with their respective number of moles. It is represented as \Delta H

The equation used to calculate enthalpy change is of a reaction is:  

\Delta H_{rxn}=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)]

For the given chemical reaction:

Mg(OH)_2(s)+2HCl(g)\rightarrow MgCl_2(s)+2H_2O(g)

The equation for the enthalpy change of the above reaction is:

\Delta H_{rxn}=[(1\times \Delta H_f_{(MgCl_2(s))})+(2\times \Delta H_f_{(H_2O(g))})]-[(1\times \Delta H_f_{(Mg(OH)_2(s))})+(2\times \Delta H_f_{(HCl(g))})]

We are given:

\Delta H_f_{(Mg(OH)_2(s))}=-924.5kJ/mol\\\Delta H_f_{(HCl(g))}=-92.30kJ/mol\\\Delta H_f_{(MgCl_2(s))}=-641.8kJ/mol\\\Delta H_f_{(H_2O(g))}=-241.8kJ/mol

Putting values in above equation, we get:

\Delta H_{rxn}=[(1\times (-641.8))+(2\times (-241.8))]-[(1\times (-924.5))+(2\times (-92.30))]\\\\\Delta H_{rxn}=-16.3kJ

Hence, the standard enthalpy change of the reaction is coming out to be -16.3 kJ

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