Based on the options given, the most likely answer to this query is C. phosphate buffer system. This type of buffer system is observed to operate among the fluids of the cells. Thank you for your question. Please don't hesitate to ask in Brainly your queries.
Answer:
<h2>9.42 moles</h2>
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
![n = \frac{N}{L} \\](https://tex.z-dn.net/?f=n%20%3D%20%20%5Cfrac%7BN%7D%7BL%7D%20%5C%5C)
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
![n = \frac{5.67 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 9.418604...](https://tex.z-dn.net/?f=n%20%3D%20%20%5Cfrac%7B5.67%20%5Ctimes%20%20%7B10%7D%5E%7B24%7D%20%7D%7B6.02%20%5Ctimes%20%20%7B10%7D%5E%7B23%7D%20%7D%20%20%5C%5C%20%20%3D%209.418604...)
We have the final answer as
<h3>9.42 moles</h3>
Hope this helps you
Answer:
About 3.5 kJ.
Explanation:
Recall the heat transfer equation:
![\displaystyle q = mC\Delta T](https://tex.z-dn.net/?f=%5Cdisplaystyle%20q%20%3D%20mC%5CDelta%20T)
Where <em>q</em> is the heat; <em>m</em> is the mass of the substance; <em>C</em> is its specific heat; and Δ<em>T</em> is the change in temperature.
The given specific heat of iron is 462 J/kg -°C.
Substitute and evaluate. Ensure correct units:
![\displaystyle \begin{aligned} q & = (1\text{ kg})\left(\frac{462\text{ J}}{\text{kg -$^\circ$C}}\right)(27.5\text{ $^\circ$C} - 20.0\text{ $^\circ$C}) \\ \\ & = (1\text{ kg})\left(\frac{462\text{ J}}{\text{kg -$^\circ$C}}\right)(7.5\text{ $^\circ$C}) \\ \\ & = 3.5\times 10^3 \text{ J} = 3.5\text{ kJ}\end{aligned}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Cbegin%7Baligned%7D%20q%20%26%20%3D%20%281%5Ctext%7B%20kg%7D%29%5Cleft%28%5Cfrac%7B462%5Ctext%7B%20J%7D%7D%7B%5Ctext%7Bkg%20-%24%5E%5Ccirc%24C%7D%7D%5Cright%29%2827.5%5Ctext%7B%20%24%5E%5Ccirc%24C%7D%20-%2020.0%5Ctext%7B%20%24%5E%5Ccirc%24C%7D%29%20%5C%5C%20%5C%5C%20%26%20%3D%20%281%5Ctext%7B%20kg%7D%29%5Cleft%28%5Cfrac%7B462%5Ctext%7B%20J%7D%7D%7B%5Ctext%7Bkg%20-%24%5E%5Ccirc%24C%7D%7D%5Cright%29%287.5%5Ctext%7B%20%24%5E%5Ccirc%24C%7D%29%20%5C%5C%20%5C%5C%20%20%26%20%3D%203.5%5Ctimes%2010%5E3%20%5Ctext%7B%20J%7D%20%3D%203.5%5Ctext%7B%20kJ%7D%5Cend%7Baligned%7D)
Therefore, the block of iron absorbed about 3.5 kJ of heat.
Answer:
El método científico es una metodología para obtener nuevos conocimientos, que ha caracterizado históricamente a la ciencia, y que consiste en la observación sistemática, medición, experimentación y la formulación, análisis y modificación de hipótesis. Las principales características de un método científico válido son .
Explanation: