Density = mass/volume
D = 500 g /200 cm^3
D = 2.5 g/cm^3
hope this helps!
It was similar because they both arranged the elements in order of increasing atomic mass.
Answer:
3.43 * 10^23 atoms of zinc
Explanation:
According to Avogadro's law, one mole of a substance contains a certain number of atoms of the substance commonly referred to as the Avogadro's number.
We already know from Avogadro's law that;
1 mole of zinc contains 6.02 * 10^23 atoms of zinc
Therefore;
0.57 mole of zinc will contain 0.57 * 6.02 * 10^23/1
which gives us 3.43 * 10^23 atoms of zinc
Answer:
1.55 mol
Step-by-step explanation:
We can use the <em>Ideal Gas Law</em> to solve this problem.
pV = nRT Divide both sides by RT
n = (pV)/(RT)
Data:
p = 1.40 atm
V = 27.5 L
R = 0.082 06 L·atm·K⁻¹mol⁻¹
T = 302 K
Calculations:
n = (1.40 × 27.5)/(0.082 06 × 302)
= 1.55 mol
Answer:
As moedas ficam sujas devido ao oxigênio do ar reagindo com o metal para formar óxido de cobre. Eles se tornam mais escuros à medida que envelhecem, à medida que a camada de óxido aumenta. O vinagre é um ácido (ácido acético) que pode ser usado para limpar superfícies e remover os óxidos indesejados.
Explanation:
