Answer:
52.08grams
Explanation:
Heat of fusion is the energy needed to transform solid water into liquid water. Hess's Law.
The temperature change Liquid water to Solid Ice. 20 degrees C --> 0 degrees C. is 20 degree C.
The heat needed for this is = 4.184 J/(g*C) * (36 grams of water) * 20 degrees C = 3012 joules of energy.
Liquid water to solid water.
Heat of fusion of water is 335j/g = 6.02kJ/mol
The heat needed for this is 6.02 kJ/mol * 2 moles of water = 12.04 kJ = 12040 joules of energy.
Adding the two energies, we have a total energy iof 15052 joules.
15052 joules = H(vap of CCl2F2) * grams of CCl2F2 needed = 289 J/g * x grams 15052 / 289 = 52.08 grams needed.
Answer:
Some bacteria like <em><u>rhizobium</u></em> and <u><em>blue green algae</em></u> are able to fix nitrogen gas from the atmosphere to enrich the soil with nitrogen compounds and increase its fertility. The nitrogen-fixing bacteria and blue green algae are called <u><em>biological nitrogen fixers.</em></u>
Answer:
See below
Step-by-step explanation:
An exothermic reaction tends to occur spontaneously because the products are more stable than the reactants.
Nature tries to get to the lowest energy state.
<span>A chain reaction keeps going on its own once started</span>
