Density of unit cell is mathematically expressed as
D =
where, Z = number of atoms/unit cell = 4 (For FCC structure)
Atomic weight of Cu = 63.5 g
a = edge length = 351 pm = 351 X 10^-10 cm
Avagadro's number = 6.023 X 10^23
∴ Density of unit cell =
= 9.752 g/cm3
Now, for FCC structure a = √8 r
where r = radius of Cu
∴ r = a/√8 = (351 X 10^-10)/√8 = 1.24 X 10^-8 cm = 124 pm
Respuesta:
14,9 g
Explicación:
Paso 1: Calcular los moles de gas
Una garrafa contiene 9 L de gas a 18°C (291 K) y 780 Torr. Podemos encontrar los moles de gas (n) usando la ecuación del gas ideal.
P × V = n × R × T
n = P × V/R × T
n = 780 torr × 9 L/(62,4 Torr.L/mol.K)/ × 291 K = 0.387 mol
Paso 2: Calcular la masa molar del gas
El gas tiene una densidad (ρ) de 2 g/L a 80 °C (353 K) y 1,5 atm. Podemos calcular la masa molar (M) del gas usando la siguiente fórmula.
ρ = P × M / R × T
M = ρ × R × T / P
M = 2 g/L × (0.082 atm.L/mol.K) × 353 K / 1,5 atm = 38,59 g/mol
Paso 3: Calcular la masa del gas (m)
Usaremos la siguiente formula.
m = n × M = 0.387 mol × 38,59 g/mol = 14,9 g
6.96 * 10^5 km for sun radius
0.00019 mm for bacterial cells
No reaction will occur because magnesium is more reactive than zinc. If you did the reverse ( magnesium particles in zinc sulphate solution) than a reaction will occur in which the zinc will be displaced from solution.
The most highly unionized part of the U.S. workforce is the: government sector.
<h3>
What industries are most unionized?</h3>
The U.S. Bureau of Labor Statistics today announced that in 2021, the number of wage and salary workers who were union members decreased further (-241,000) to 14.0 million, and the percentage of those who were union members—the union membership rate—was 10.3 percent. The rate is lower than it was in 2020, when it was higher due to a disproportionately significant reduction in the total number of nonunion employees relative to the decline in the number of union members. In 2020, the rate was 10.8 percent. The rate of unionisation in 2021 will be 10.3%, the same as in 2019. In 1983, the first year for which comparable union data are available, there were 17.7 million union employees and a 20.1 percent union membership rate.
learn more about Labor Statistics refer:
brainly.com/question/20908928
#SPJ4