Answer:
30.7 g of O₂ are produced
Explanation:
This is a redox reaction, where the peroxide is reduced to oxygen and oxidized to hydroxide. The equation is this one:
2Na₂O₂ + 2H₂O → 4NaOH + 3O₂
We assume that water is in excess, so the peroxide is the limiting reagent.
We convert the mass to moles: 50 g . 1mol / 78 g = 0.641 moles
2 moles of peroxide can produce 3 moles of oxygen (according to stoichiometry)
Then, 0.641 moles of peroxide will produce (0.641 . 3 ) /2 = 0.961 moles O₂
Finally, we convert the moles to mass: 0.961mol . 32 g / 1mol = 30.7 g of O₂
Answer:
galena
Explanation:
The green eye paint was made of malachite, a copper carbonate pigment, and the black kohl was made from galena, a dark grey ore.
Answer:
Explanation:
Hello,
In this case, we find the following states:
a. Liquid salt water at 28.0 °C.
b. Liquid salt water at 102.5 °C.
c. Vapor salt water at 102.5 °C.
The first process (1) is to heat the liquid water from 28.0 °C to 102.5 °C and the second one (2) to vaporize the liquid salt water. In such a way, each process has an amount of energy that when added, yields the total energy for the process as shown below:
Best regards.
Answer:
D. Its temperature will remain 100 C until all the vapours condenses
Explanation:
Heat absorbed by a substance to change the state of matter is known as latent heat. This heat is utilized to break the bonds between atoms of the substance so that they can undergo phase change.
So, when water boils at 100 degree Celsius then temperature will remain constant unless and until all the water changes into vapor. As it is the latent heat that breaks the bonds between hydrogen and oxygen atoms of water so that liquid state can change into gaseous state.
Since latent heat is a hidden heat, that is why, it does not get reflected and there is no change in temperature due to it.
Thus, we can conclude that it is true that temperature will remain at 100°C until all the vapor condenses for a sample of water vapor at 101°C as it cools.
Explanation:
the answer will be 98.4 kJ
