134.56 grams are 2.50 * 10^23 molecules of CaO.
Explanation:
According to Avagadro hypothesis, 1 mole of a substance contain 6.023 x 10^23 molecules or particles.
Data given:
Number of molecules of CaO =
FORMULA USED IN CALCULATION:
number of molecules = 6.02 x 10^23 x number of moles of CaO
At first number of moles is calculated:
= 2.4 moles of CaO is present
to calculate the mass of CaO in grams formula used is
mass = atomic mass x number of moles
atomic mass of CaO = 56.07 grams/mole
mass = 2.4 x 56.07
= 134.56 grams of calcium oxide is present is 2.50 * 10^23 molecules of CaO.
Total density of filled ball with carbon dioxide gas: 
The relationship between mass and volume can be easily determined using density; for example, the mass of a body is equal to its volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d). The ball filled with carbon dioxide will not float in the air because total density of filled ball is greater than the density of an air. Density of the evacuated ball D = 0.214 g/L
Density of carbon dioxide gas = 
Mass of the carbon dioxide gas : 
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Answer:
See explanation
Explanation:
Lithium, sodium, and magnesium are metals found towards the left hand side in the periodic table. They are highly electropostive and have highly negative reduction potentials. The reduction potentials of the metals are listed below;
Li -3.04 V
Na -2.71 V
Mg -2.37 V
These metals easily loose electrons making them highly preferable for use as the anode of batteries.
Lithium-ion batteries are the most commonly used types of battery. This is because the reduction potential of Li is very negative hence it looses electrons easily and current starts flowing.
Secondly, Lithium-ion batteries are easily rechargeable compared to those of sodium and magnesium.
Answer:
Ozon prevents us from UV rays of the sun. Ozone hole means that UV rays are entering the Earth. This results in cancer.
Explanation:
Chlorofluorocarbons are causing this
