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k0ka [10]
3 years ago
7

23491pa undergoes beta decay. what is the mass number of the resulting element?

Chemistry
2 answers:
forsale [732]3 years ago
8 0

Answer:

234 is the mass number of the resulting element that is uranium.

Explanation:

Beta-decay is nuclear process in which a neutron gets converted into a proton and an electron releasing a beta-particle. The beta particle released carries a charge of -1 units.

_Z^A\textrm{X}\rightarrow _{Z+1}^A\textrm{Y}+_{-1}^0\beta

So, when protactinium-234 undergoes beta decay to form uranium-234 as resultant element.

The reaction can be expressed as:

_{91}^{234}\textrm{Pa}\rightarrow _{92}^{234}\textrm{U}+_{-1}^0\beta

234 is the mass number of the resulting element that is uranium.

qaws [65]3 years ago
3 0
Answer is: mass number is 234.
Beta decay is radioactive decay<span> in which a </span>beta ray<span> and a </span>neutrino<span> are emitted from an </span><span>atomic nucleus.
</span>There are two types of beta decay: beta minus<span> and </span>beta plus. <span> In beta minus </span><span>decay, neutron is converted to a proton and an </span>electron<span> and an </span>electron antineutrino and in beta plus <span>decay, a proton is converted to a neutron and </span>positron<span> and an </span>electron neutrino, so mass number does not change.
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See image attached for structure of CH3Br

Explanation:

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8 0
2 years ago
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Semmy [17]
Surface runoff, its quite obvious in the picture

3 0
3 years ago
Which of the following statements is true regarding both theories and laws?
Mariana [72]

Answer:

D. Supported by observations

Explanation:

Because theories change over time, they both need to be proven, they do not go off of consensus, but they do need to be supported by observations.

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6 0
2 years ago
Why do northern lights appear in different colors? Because charged particles of solar wind ignite different gases in Earth's atm
Fofino [41]

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6 0
2 years ago
A 118-ml flask is evacuated and found to have a mass of 97.129 g. when the flask is filled with 768 torr of helium gas at 35 ?c,
Inessa05 [86]
The full question asks to decide whether the gas was a specific gas. That part is missing in your question. You need to decide whether the gas in the flask is pure helium.

To decide it you can find the molar mass of the gas in the flask, using the ideal gas equation pV = nRT, and then compare with the molar mass of the He.

From pV = nRT you can find n, after that using the mass of gass in the flask you use MM = mass/moles.

1) From pV = nRT, n = pV / RT

Data:
V = 118 ml = 0.118 liter
R = 0.082 atm*liter/mol*K
p = 768 torr * 1 atm / 760 torr = 1.0105 atm
T = 35 + 273.15 = 308.15 K

n = 1.015 atm * 0.118 liter / [ 0.082 atm*liter/K*mol  * 308.15K] =0.00472 mol

mass of gas = mass of the fask with the gas - mass of the flasl evacuated = 97.171 g - 97.129 g = 0.042

=> MM =  mass/n = 0.042 / 0.00472 = 8.90 g/mol

Now from a periodic table or a table you get that the molar mass of He is 4g/mol

So the numbers say that this gas is not pure helium , because its molar mass is more than double of the molar mass of helium gas.
7 0
3 years ago
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