dtrammel91
24.01.2021 •
Chemistry
2. A quantity of 1.922g of methanol (CH3OH) was burned in a constant-volume
bomb calorimeter. Consequently the temperature of the water rose by 4.20C.
If the heat capacity of the bomb plus water was 10.4KJ/C, calculate the molar
heat of combustion of methanol.
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Ответ:
Change in Temperature (t) = 4.20°C
Heat capacity of the bomb plus water = 10.4 KJ/oC
The heat absorbed by the bomb and water is equal to the product of the heat capacity and the temperature change.
Let’s assume that no heat is lost to the surroundings. First, let’s calculate the heat changes in the calorimeter. This is calculated using the formula shown below:
qcal = Ccalt
Where, qcal = heat of reaction
Ccal = heat capacity of calorimeter
t = change in temperature of the sample
Now, let’s calculate qcal:
qcal = (10.4 kJ/°C)(4.20°C)
= 43.68 kJ
Always qsys = qcal + qrxn = 0,
qrxn = -43.68 kJ
The heat change of the reaction is - 43.68 kJ which is the heat released by the combustion of 1.922 g of CH3OH. Therefore, the conversion factor is:
Ответ:
una alimentación saludable y la práctica de ejercicios físicos contribuyen al normal funcionamiento de la tiroides y mejoran el estado de ánimo
Explanation:
La tiroides es una glándula cuya función es secretar hormonas tiroideas tales como tiroxina y triyodetironina, las cuales están implicadas en el crecimiento y el control del metabolismo. Es bien conocido que problemas de salud tales como hipotiroidismo (hormonas tiroideas a concentraciones muy bajas) o hipertiroidismo (hormonas tiroideas a concentraciones excesivamente altas) afectan el estado de ánimo, y llevan a cuadros de estrés emocional como ansiedad y depresión. Una alimentación balanceada basada en alimentos ricos en yodo (pescados del mar, huevos, camarones) y zinc (maní, carne, semillas de calabaza, almendras), como así también el ejercicio físico regular, pueden producir el restablecimiento de los niveles normales de tiroxina y triyodotironina en personas con hipotiroidismo, lo cual ha sido asociado con una mejora inmediata en el estado de ánimo.