Answer:
The number of protons in an atom define each individual element because the number of protons is the atomic number which is the defining property of an atom and never changes. The number of protons determines an atom's identity. For example, Oxygen has an atomic number of 8, so it has 8 protons, so no matter what ionic compound or molecule it's part of, every single Oxygen atom will always have 8 protons each.
It is two or more objects and different things that can be removed from each other.
Answer:
protista, fungi, plant, animal
Explanation:
this is the answer
Answer:
2.79 mg iron-59 is left in the sample after 267 days.
Explanation:
Given that:
Half life = 44.5 days
Where, k is rate constant
So,
The rate constant, k = 0.0156 days⁻¹
Using integrated rate law for first order kinetics as:
![[A_t]=[A_0]e^{-kt}](https://tex.z-dn.net/?f=%5BA_t%5D%3D%5BA_0%5De%5E%7B-kt%7D)
Where,
![[A_t]](https://tex.z-dn.net/?f=%5BA_t%5D)
is the concentration at time t
![[A_0]](https://tex.z-dn.net/?f=%5BA_0%5D)
is the initial concentration = 180 mg
Time = 267 days
So,
![[A_t]=180\ mg\times e^{-0.0156\times 267}](https://tex.z-dn.net/?f=%5BA_t%5D%3D180%5C%20mg%5Ctimes%20e%5E%7B-0.0156%5Ctimes%20267%7D)
![[A_t]=180\times e^{-0.0156\times 267}\ mg](https://tex.z-dn.net/?f=%5BA_t%5D%3D180%5Ctimes%20e%5E%7B-0.0156%5Ctimes%20267%7D%5C%20mg)
![[A_t]=2.79\ mg](https://tex.z-dn.net/?f=%5BA_t%5D%3D2.79%5C%20mg)
<u>2.79 mg iron-59 is left in the sample after 267 days.</u>
