A binary compound created by reaction of bismuth and an unknown element E contains 52.07% Bi and 47.93% E by mass. If the formul
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Solution :
It is given that :
The formula of the compound =
And that 4.70 g of the sample contains mol of Br.
It means that :
1 mol of contains = 3 mol of Br
∴ 3 mol of contain in 1 mol of
mol of
contains
mol of
Thus the mol of =
mol
The given mass is = 4.700 g
Therefore, the of
= 298.4 g/mol
So of
=
of X + 3 x
of Br
298.4 g/mol = of X + 3 x 79.90 g/mol
298.4 g/mol = of X + 239.7 g/mol
of X = 58.71 g/mol (since 1 amu = 1 g/mol)
Therefore the atomic mass of the unknown metal = 58.71 g/mol
So the unknown meta is Nickel.
Wavelength of the light is 2.9 × 10⁻⁷ m.
<u>Explanation:</u>
Planck - Einstein equation shows the relationship between the energy of a photon and its frequency, and they are directly proportional to each other and it is given by the equation as E = hν,
where E is the energy of the photon
h is the Planck's constant = 6.626 × 10⁻³⁴ J s
ν is the frequency
From the above equation, we can find the frequency by rearranging the equation as,
ν = =
Now the frequency and the wavelength are in inverse relationship with each other.
ν × λ = c
It can be rearranged to get λ as,
λ = c / ν
=
So wavelength is 2.9 × 10⁻⁷ m.