Answer:
Option A.
2Na + 2H2O —> 2NaOH + H2
Explanation:
To know which option is correct, we shall do a head count of the number of atoms present on both side to see which of them is balanced. This is illustrated below below:
For Option A:
2Na + 2H2O —> 2NaOH + H2
Reactant >>>>>>> Product
2 Na >>>>>>>>>>> 2 Na
4 H >>>>>>>>>>>> 4 H
2 O >>>>>>>>>>>> 2 O
Thus, the above equation is balanced.
For Option B:
2Na + 2H2O —> NaOH + H2
Reactant >>>>>>> Product
2 Na >>>>>>>>>>> 1 Na
4 H >>>>>>>>>>>> 3 H
2 O >>>>>>>>>>>> 1 O
Thus, the above equation is not balanced.
For Option C:
2Na + H2O —> 2NaOH + H2
Reactant >>>>>>> Product
2 Na >>>>>>>>>>> 2 Na
2 H >>>>>>>>>>>> 4 H
1 O >>>>>>>>>>>> 2 O
Thus, the above equation is not balanced.
For Option D:
Na + 2H2O —> NaOH + 2H2
Reactant >>>>>>> Product
1 Na >>>>>>>>>>> 1 Na
4 H >>>>>>>>>>>> 5 H
2 O >>>>>>>>>>>> 1 O
Thus, the above equation is not balanced.
From the illustrations made above, only option A is balanced.
As per the question, the mass of the nitrogen gas m = 22.25 gram.
The latent heat of vaporization of nitrogen = 199.0 j/g
As per the question, the nitrogen gas will condense. During condensation, the nitrogen gas will lose or release heat equal to its latent heat.
Hence, the heat released by nitrogen gas Q = ml = 22.25 × 199.0 J = 4427.75 J.
Hence, the amount of heat released will be 4427.75 J.
<h3>How can you figure out how much heat is in each gram?</h3>
The formula: can be utilized to determine energy. Q = mc ∆T. In the equation, Q stands for energy expressed in joules or calories, m for mass expressed in grams, c for specific heat, and T for temperature change, which is the difference between the final temperature and the initial temperature. Water has a specific heat of 1 calorie/gram °C.
Learn more about energy here:
brainly.com/question/1932868
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Answer:
By strengthening the weak coral that is on the reef.
The image<span> formed by a plane </span>mirror<span> is always virtual (meaning that the light rays </span>do<span> not actually come from the </span>image<span>), upright, and of the same shape and size as the object it is reflecting. A virtual </span>image<span> is a copy of an object formed at the location from which the light rays </span>appear<span> to come.</span>
The correct answer is reaction 2 most likely occurred in their experiment.
So the given two reactions are as follows:
1) Au³⁺(aq) + Co(s) --> Au(s) + Co³⁺(aq)
2) 2Au³⁺(aq) + 3Co(s) --> 2Au(s) + 3Co³⁺(aq)
Mass of Co = 6.087 g
Molar mass of Co = 58.933 g/mol
Moles of Co =
= 0.1032
Mass of Au = 13.572 g
Molar mass of Au = 196.967 g/mol
Moles of Au = 
= 0.069
Now based on reaction 1) the molar ratio between Co and Au is 1:1
So as per this reaction 0.1032 moles of Co would produce 0.1032 mole of Au
Again based on reaction 2) the molar ratio between Co and Au is 3:2
So as per this reaction 0.1032 moles of Co would produce 
mole of Au
or, As per the second reaction 0.1032 moles of Co would produce 0.0688 moles of Au
