Answer:
Yes, it can be extracted through evaporation. It retains its original properties.
Explanation:
i took the test.
Answer:
Option A is correct.
Because two molecules of NO are consumed per molecule of O2, the rate of disappearance of O2(g) is 2.5×10−5 Ms−1.
Explanation:
2NO(g) + O2(g) → 2NO2(g)
The rate of a chemical reaction is defined as the amount of reactant used up or the amount of products formed in the reaction.
From the chemical balance, 2 moles of NO gives 1 mole of O2, hence, it is evident that 2 molecules of NO is consumed per 1 molecule of O2.
Hence, the rate of consumption of O2 is exactly half of the rate of consumption of NO.
Rate of consumption of O2 = (1/2) × Rate of consumption of NO = (1/2) × 5.0×10−5 Ms−1
= (2.5×10−5) Ms−1
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Answer:
The time required to melt the frost is 3.25 hours.
Explanation:
The time required to melt the frost dependes on the latent heat of the frost and the amount of heat it is transfered by convection to the air .
The heat transferred per unit area can be expressed as:
being hc the convective heat transfer coefficient (2 Wm^-2K^-1) and ΔT the difference of temperature (20-0=20 °C or K).
If we take 1 m^2 of ice, with 2 mm of thickness, we have this volume
The mass of the frost can be estimated as
Then, the amount of heat needed to melt this surface (1 m²) of frost is
The time needed to melt the frost can be calculated as
Answer:
the relationship between mass and volume