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hannahdrumsey
10.03.2020 •
Chemistry
Ten kilograms of R-134a fill a 1.595-m3 weighted piston-cylinder device at a temperature of −26.4°C. The container is now heated until the temperature is 100°C. Determine the final volume of the R-134a.
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Ответ:
Explanation:
The given data is as follows.
Mass of refrigerant, m = 10 kg
Volume of the refrigerant, V = 1.595![m^{3}](/tpl/images/0540/4289/2b022.png)
Formula for specific volume of the refrigerant is as follows.
v =![\frac{V}{m}](/tpl/images/0540/4289/7c511.png)
= 0.1595![m^{3}/kg](/tpl/images/0540/4289/26446.png)
So, at
specific volume will be within
and
and pressure is constant.
The fluid will be in super-heated state at temperature
and at T =
pressure 1 bar = 0.1 MPa.
According to super-heated tables, the specific volume is v = 0.30138
.
Hence, the final volume will be calculated as follows.
=![0.30138 m^{3}/kg \times 10 kg](/tpl/images/0540/4289/26e65.png)
= 3.0138![m^{3}](/tpl/images/0540/4289/2b022.png)
Thus, we can conclude that final volume of the R-134a is 3.0138
.
Ответ:
4x + 72 + 2x - 12 = 180
6x + 60 = 180
6x = 180 -60
6x = 120
x = 120/6
x = 20