Answer:
~69.744 moles of Ca
Explanation:
Using Avogadro's constant , we know that:
1 mole = 6.022 x 10^23 atoms
S0, the number of moles in 4.20 x 10^25 atoms of Ca:
=(4.20 x 10^25 x 1 )/(6.022 x 10^23)
~69.744 moles of Ca
Q2:How many atoms are in 0.35 moles of oxygen?
1 mole = 6.022 x 10^23 atoms
S0, the number of atoms in 0.35 moles of oxygen:
=[0.35 x (6.022 x 10^23)]
=2.1077 x 10^23 atoms of Oxygen
Hope it helps:)
A atomic number hope i helped
In a mixture, we can separate the elements or compounds inside easily by using physical methods, such as filtration, evaporation, distillation etc.
However, a compund is two or more elements chemically combined together, so we cannot separate them using physical methods, only with checmicals methods such as apply heat or electricity (electrolysis)
Answer:
the plates move which causes an earthquake.
Explanation:
i learned about this.