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Sergio039 [100]
3 years ago
5

What is the maximum theoretical efficiency possible for a heat engine operating between a reservoir in which ice and water coexi

st, and a reservoir in which water and steam coexist? The pressure is constant at 1.0 atmosphere for both reservoirs.
Chemistry
1 answer:
Tju [1.3M]3 years ago
6 0

Answer:

\eta_{th} = 26.8\,\%

Explanation:

The maximum theoretical efficiency for a heat engine is given by the Carnot's Cycle. The temperatures of the hot reservoir and the cold reservoir at 1.0 atmosphere are 373.15 K and 273.15 K, respectively. Then:

\eta_{th} = \left(1 - \frac{T_{L}}{T_{H}}  \right)\times 100\,\%

\eta_{th} = \left(1-\frac{273.15\,K}{373.15\,K}  \right)\times 100\,\%

\eta_{th} = 26.8\,\%

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C. How many grams of Na2SiO3 can react with 0.800 g of HF?
finlep [7]

Answer:

Mass = 0.610 g

Explanation:

Given data:

Mass of Na₂SiO₃ = ?

Mass of HF = 0.800 g

Solution:

Chemical equation:

Na₂SiO₃ + 8HF   →    H₂SiF₆ + 2NaF + 3H₂O

Number of moles of HF:

Number of moles = mass/ molar mass

Number of moles = 0.800 g/ 20 g/mol

Number of moles = 0.04 mol

Now we will compare the moles of HF and Na₂SiO₃.

           HF        :        Na₂SiO₃

            8          :          1

            0.04    :       1//8×0.04 = 0.005

Mass of Na₂SiO₃:

Mass = number of moles × molar mass

Mass =   0.005 mol  × 122.07 g/mol  

Mass = 0.610 g

5 0
3 years ago
Why do metallic properties gradually change into non-metallic in the same period ?​
erma4kov [3.2K]
Metallic and non-metallic properties
Non-metallic property increases across a period and decreases down the group due to the same reason due to an increase in nuclear attractive force.

I hope this helps
8 0
3 years ago
If a substance is covalent, then it likely will
kati45 [8]
Not be soluble in water
5 0
3 years ago
Read 2 more answers
What creates an electric current in a battery?
kramer

Answer:

There's a separate chemical reaction happening at the positive electrode, where incoming electrons recombine with ions taken out of the electrolyte, so completing the circuit. The electrons and ions flow because of the chemical reactions happening inside the battery—usually two of them going on simultaneously.

Explanation:

option (B) is right

7 0
3 years ago
Find the mass of oxygen in grams produced by the decomposition of 100.0 g of CO2
SSSSS [86.1K]

The balanced chemical equation is :

2CO_2->2CO+O_2\\\\

Moles of CO_2 ,

n = \dfrac{100\ g}{44.01\ g/mol}\\\\n=2.27\ mol

Now, by given chemical equation , we can see 2 mole of CO_2 react with 1 mole of O_2.

So , 2.27 mole react with :

N=\dfrac{2.27}{2}\ mol\\\\N=1.135\ mol

Mass of oxygen is :

M = N \times 16\\\\M=1.135\times 16\ g\\\\M =18.16\ g

Therefore, mass of oxygen in grams produced is 18.16 g.

Hence, this is the required solution.

7 0
3 years ago
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