Explanation:
A mole is the amount of matter or substance that contains the Avogadro's number of particles.
1 mole of a substance = 6.02 x 10²³ atoms
Now solving:
a:
1.2 x 10² atoms ;
Number of moles = = 2.0 x 10⁻²¹moles
b:
3.87 x 10²¹ molecule:
Number of moles = = 6.4 x 10⁻³moles
c. 4.81 x 10¹⁴ molecules:
Number of moles = = 8.0 x 10⁻¹⁰moles
Number of molecules = number of atoms = formula units
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The correct option would be A. same group.
They have similar chemical properties as they would have the same number of electrons in their outer shells.
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Answer:
Explanation:
Hello,
In this case, since the density is the ratio of the mass and volume:
For the given density and volume, the correct mass which fills the given volume is:
Best regards.
Answer:
CO2
Explanation:
CO2 or carbon dioxide is produced when iron is extracted from its ore. Carbon monoxide Co is used as reducing agent in iron extraction. In this reaction iron ore is reduced to iron and CO is oxidized to CO2 or carbon dioxide which is released in the process. There extraction of iron is redox reaction.
Answer:
The temperature over the land has become higher than the temperature over the water.
Explanation:
The air over the warmer land becomes heated and rises, and the cooler and denser air over the water moves in to take its place.
A is wrong. Clouds move where the upper air currents take them.
B is wrong. The highest air temperature of the day may still be lower than that of the air over the water.
D is wrong. Higher air temperature over the water would create a land breeze.