Respuesta :
Answer:
Strontium [tex]94_{38}[/tex]Sr
Explanation:
By the law of mass conversion the nuclear mass remains constant in a reaction which means initial mass and atoic number will be equal to final atomic number and atomic mass respectively.
²³⁵₉₂U + ¹₀n → ? + ¹³⁹₅₄Xe + 3 ¹₀n
Here atomic mass =
235 + 1 = A + 139+3 ( A -= atomic mass of ?)
A = 236 - 142
A = 94
And, atomic number would be =
92 = B + 54
B = 92 - 54
B = 38
So, the atomic number of ? will be 38 and atomic mass will be = 94
The element with 38 atomic number is = Strontium [tex]94_{38}[/tex]Sr
The missing species in the equation is ⁹⁴₃₈Sr
Let the missing species be ᵇₐY
We can write the equation as:
²³⁵₉₂U + ¹₀n → ᵇₐY + ¹³⁹₅₄Xe + 3¹₀n
- Next, we shall determine the value of b
235 + 1 = b + 139 + 3(1)
236 = b + 139 + 3
236 = b + 142
Collect like terms
236 – 142 = b
b = 94
- Next, we shall determine the value of a
92 + 0 = a + 54 + 0
92 = a + 54
Collect like terms
92 – 54 = a
a = 38
- Finally, we shall determine Y
b = 94
a = 38
Y =?
ᵇₐY => ⁹⁴₃₈Y => ⁹⁴₃₈Sr
The balanced equation is:
²³⁵₉₂U + ¹₀n → ⁹⁴₃₈Sr + ¹³⁹₅₄Xe + 3¹₀n
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