A. 3
B. 4
C. 6
D. 4
I hope I could answer your question
Thank you for posting your question here. The answer is -60.57. With appropriate sig figs it becomes -60.6 KJ.
<span>Maybe it's easier if I write what I did out: </span>
<span>2H2O > 2H2 +O2...............-H= 2* -285.83 </span>
<span>Ca + O2 + H2 > Ca(OH)2....H= -986.2 </span>
<span>2C + H2 > C2H2.................H= 226.77 </span>
<span>The above H's stand for standard enthalpy of formations. These can be found in textbook appendix. Notice the negative infront of the enthalpy (H) for H2O. This is to remind me/you that the heat lost is gained in the rxn. </span>
<span>So then you add them up. 226.77 - 986.2 + (2*285.83) = -187.77 </span>
<span>Add back the total enthalpy that is given in the question -187.77+127.2 = -60.57 </span>
<span>If signs cross you up find a way to remember that works for you. </span>
Photosynthesis is the process in which a plant absorbs minerals, water, carbon dioxide and of course sunlight. It then converts all of this into starch, which is its energy, and its main by-product oxygen, which it releases into the air.
Answer:
Son aquellas características que comparte absolutamente toda la materia, sin distinción de su composición, forma, presentación o elementos constitutivos. Las propiedades generales no permiten diferenciar una sustancia de otra. Algunas propiedades extrínsecas son la masa, el volumen, el peso y la temperatura
Explanation:
espero que esto ayude