Explanation:
1 kJ = 238.85 cal and
1 cal = 0.004187 kJ
so it will be 78.9×238.85 = <em><u>1</u></em><em><u>8</u></em><em><u>,</u></em><em><u>8</u></em><em><u>4</u></em><em><u>4</u></em><em> </em>calories
78.9 Kilojoules (kJ) = 18,844 Calories (IT) (cal)
The temperature of liquid nitrogen (LN), an inert cryogenic fluid, is 196 °C (320 °F). To drop the temperature of the concrete as much as is possible without causing it to freeze, LN is directly injected by lances into the batch water storage tank, the aggregate, or the mixer.
<h3>What is Cryopreservation ?</h3>
Cryopreservation is the process of preserving live cells, tissues, and other biological samples by placing them in a deep freezer at extremely low temperatures. The sample is typically stored at 196°C or lower. All of a cell's biological processes come to an end at such low temperatures, and the cell dies.
- Cells and tissues intended for transplantation are frequently stored via cryopreservation. A extremely stable ultra-low temperature environment is provided by liquid nitrogen. It is therefore employed for long-term storage.
Learn more about Cryopreservation here:
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Answer:
[Hg] = 3.4 x 10⁻⁶ M
Explanation:
Parts per million (ppm) is defined as (1 g solute) / (10⁶ g solution), or (10⁻⁶g solute) / (g solution). Here the density of the stream is 1.0 g/mL, so ppm is equal to 10⁻⁶g/mL.
The atomic mass of mercury is 200.59 g/mol, so the molarity is calculated as follows:
0.68ppm = (0.68 x 10⁻⁶g)/mL x (1000mL/L) x (mol/200.59g) = 3.4 x 10⁻⁶ M