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2 years ago

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Polonium has a mass number of 212 and an atomic number of 84. In a balanced nuclear reaction, polonium releases an alpha particl

e to produce lead. Which option is the atomic number of lead?(1 point)
210

208

80

82
plss help
right answer only

1 answer:

antoniya [11.8K]2 years ago

3 0

Answer:

D. 82

Explanation:

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In a unimolecular reaction with twice as much starting material as product at equilibrium, what is the value of Keq? Is ΔG o pos

lubasha [3.4K]

Answer : The value of $K_{eq}$ is, 0.5 and $\Delta G$ = positive.

Explanation :

The unimolecular reaction is:

$A\rightarrow B$

In unimolecular reaction, the starting material is 2 times to the product.

$A=2B$ .........(1)

As we know that:

$K_{eq}=\frac{B}{A}$ ...........(2)

Now substitute equation 1 in 2, we get:

$K_{eq}=\frac{\frac{A}{2}}{A}$

$K_{eq}=0.5$

Now we have to calculate the value of $\Delta G^o$ at 298 K.

$\Delta G^o=-RT\ln K_{eq}$

where,

$\Delta G^o$ = standard Gibbs free energy = ?

R = gas constant = 8.314 J/mol.K

T = temperature = 298 K

$K_{eq}$ = equilibrium constant = 0.5

Now put all the given values on the above formula, we get:

$\Delta G^o=-(8.314J/mol.K)\times (298K)\ln (0.5)$

$\Delta G^o=1717.32J/mol$

Thus, the value of $\Delta G^o$ at 298 K is, 1717.32 J/mol

As we know that:

$\Delta G$ = +ve, reaction is non spontaneous

$\Delta G$ = -ve, reaction is spontaneous

$\Delta G$ = 0, reaction is in equilibrium

Thus, the $\Delta G$ = +ve. So, the reaction is non spontaneous.

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3 years ago

Can any other metal effectively replace iron?

Zinaida [17]

I think no is the answer.

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3 years ago

What is the solubility of m(oh)2 in a 0.202 m solution of m(no3)2? ksp 4.45*10^-12?

umka2103 [35]

<span>M(NO</span>₃<span>)</span>₂<span> fully separates into M</span>²⁺<span> and NO</span>₃<span> </span>²⁻<span> </span><span>and M(OH)</span>₂<span> partially separates as <span>M</span></span>²⁺<span><span> and 2OH</span></span>⁻

<span>M(NO</span>₃<span>)</span>₂<span><span> </span>→ M</span>²⁺<span> + 2NO</span>₃²⁻

<span>0.202 M 0.202 M</span>

<span> M(OH)</span>₂<span>(s) ↔ <span>M</span></span>²⁺<span><span> (aq) + 2OH</span></span>⁻<span><span>(aq)</span></span>

<span>I - -</span>

<span>C -X +X +2X</span>

<span>E X 2X</span>

<span>Ksp = [M</span>²⁺<span> (aq)] [OH</span>⁻<span>(aq)]</span>²

4.45 * 10∧-12 = (0.202 + X ) (2X)²

Since X is very small, (0.202 + X ) = 0.202

<span>4.45 * 10<span>-12 </span>= 0.202 * 4X</span>²

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3 years ago

How many grams is 1.45 moles of aluminum?

schepotkina [342]

Answer:

39.1239 grams

Explanation:

1 mole of aluminum is 26.982 grams.

0.45 mole of aluminum is 12.1419 grams

26.982 + 12.1419 = 39.1239 grams

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3 years ago

Which would result in radioactive decay? Check all that apply.

Sonbull [250]

B)a neutron-to-proton ratio of 1:2 in a large nucleus

C)a nucleus that contains 90 protons and 100 neutrons

E)any isotope of the element uranium, which has atomic number 92

Explanation:

Radioactive decay process takes place between the nucleons of an atom. Some atoms can split on their own or when bombarded with some energetic particles.

Every atomic nucleus have specific proton/neutron ratio that ensures their stability.
This allows their nucleus to be stable.
Any nucleus with a proton/ratio combination different from its stability ratio will be unstable.
This can be the case of too many protons or neutrons.
Such atoms will be unstable and split into one or more other nuclei with the emission of small particles of matter.
All nuclei heavier than Bi-239 are naturally unstable and radioactive.

Learn more:

Transmutation brainly.com/question/3433940

#learnwithBrainly

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3 years ago

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