Answer:
Number of times a one pound (2.2 kg) block of iron can be split in half before it stops being iron
= 84.29 times
Explanation:
Atoms : It is the smallest indivisible particle of the matter .
The atom can not be further breakdown .
Here in this question , we have to find the number of atoms (because it is the last possible situation for breaking of atom)
Mole : The quantity of the substance that contain as many particles as present in 12 g of C-12.It is quantity which Avogadro number(N0) of particles
<u>1.First calculate the number of moles of Fe in 2.2Kg Block</u>
Mass of Iron (Fe) = 55.845 amu
Molar mass of Iron = 55.845 g
Given mass = 2.2 kg
1 kg = 1000 g
2.2 kg = 2200 g
![moles = \frac{2200}{55.845}Moles of Fe = 39.39 2.Calculate the number of particles of Fe in 39.39 moles of Block[tex]moles = \frac{Number\ of\ Particles}{Avogadro\ number}](https://tex.z-dn.net/?f=moles%20%3D%20%5Cfrac%7B2200%7D%7B55.845%7D%3C%2Fp%3E%3Cp%3E%3Cu%3E%3Cstrong%3EMoles%20of%20Fe%20%20%3D%2039.39%20%3C%2Fstrong%3E%3C%2Fu%3E%3C%2Fp%3E%3Cp%3E2.C%3Cu%3Ealculate%20the%20number%20of%20particles%20of%20Fe%20in%2039.39%20moles%20of%20%20Block%3C%2Fu%3E%3C%2Fp%3E%3Cp%3E%5Btex%5Dmoles%20%3D%20%5Cfrac%7BNumber%5C%20of%5C%20Particles%7D%7BAvogadro%5C%20number%7D)
moles = 39.39
atoms
<u>3.Calculate Number of time(n), the block is </u><u>split into -Half </u>
Take log both side ,
Solve for n, you get
n= 84.29 (convert it to nearest whole number)
n = 84 times
The 4:00 time because later that afternoon would be later in the day
Answer:
C2H2O4
Explanation:
To get the molecular formula, we first get the empirical formula. This can be done by dividing the percentage compositions by the atomic masses. The percentage compositions are shown as follows :
C = 26.86%
H = 2.239%
O = 100 - ( 26.86 + 2.239) = 70.901%
We then proceed to divide by their atomic masses. Atomic mass of carbon is 12 a.m.u , H = 1 a.m.u , O = 16 a.m.u
The division is as follows:
C = 26.86/12 = 2.2383
H = 2.239/1 = 2.239
O = 70.901/16 = 4.4313
We now divide each by the smallest number I.e 2.2383
C = 2.2383/2.2383 = 1
H = 2.239/2.2383 = 1
O = 4.4313/2.2383 = 1.98 = 2
Thus, the empirical formula is CHO2.
To get the molecular formula, we use the molar mass .
(CHO2)n = 90
We add the atomic masses multiplied by n.
(12 + 1 + 2(16))n = 90
45n = 90
n = 90/45 = 2.
Thus , the molecular formula is C2H2O4
Answer:
²³⁸₉₃Np → Pu₉₄²³⁸ + ⁰₋₁e
Explanation:
²³⁸₉₃Np → Pu₉₄²³⁸ + ⁰₋₁e
Beta radiations:
Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.
The mass of beta particle is smaller than the alpha particles.
They can travel in air in few meter distance.
These radiations can penetrate into the human skin.
The sheet of aluminium is used to block the beta radiation
⁴₆C → ¹⁴₇N + ⁰₋₁e
The beta radiations are emitted in this reaction. The one electron is ejected and neutron is converted into proton.
