Answer:Theoretical density =2.576g/cm³
Explanation:
Theoretical density p= (A×n)/Vc ×Av
A= molecular weight
n= effective number of atoms per unit cell
Vc=Volume of unit cell = a³
Av = Avogadro's constant = 6.02×10²³
Given that A= 87.2g/mol
n= 4 (For FCC crystal structure)
Vc= a³
Where a = 2R√2 and R is the atomic radius
R=0.215
a= 2 × 0.215×√2
a= 0.608nm = 0.608×10^-7 cm
Vc= (0.608×10^-7 cm)³
Vc=2.25×10^-22 cm³
P= (87.2 × 4)/
(2.25×10^-22) × (6.02×10²³)
P= 2.576g/cm³
Therefore the theoretical density of strontium is 2.576g/cm³
Answer:
D
Explanation:
Because the number of protons is the same as the atomic number, we know what the number of protons has to be 26. The mass number, 55, is the same as the number of protons plus neutrons. Lastly, because there is no charge on this atom, the number of electrons would have to be the same as the number of protons, which is 26.
The Value of a Human Life: $129,000. In theory, a year of human life is priceless. In reality, it's worth $50,000. That's the international standard most private and government-run health insurance plans worldwide use to determine whether to cover a new medical procedure.
I think the answer is A: a line that is drawn horizontally around the earth and is parallel to the Prime Meridian
Hope this helps:)
Answer:
Son aquellas características que comparte absolutamente toda la materia, sin distinción de su composición, forma, presentación o elementos constitutivos. Las propiedades generales no permiten diferenciar una sustancia de otra. Algunas propiedades extrínsecas son la masa, el volumen, el peso y la temperatura
Explanation:
espero que esto ayude
