Otaku Engineer in Great Tang Dynasty

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"Question 1: Put a certain amount of anhydrous alcohol and oxygen in a completely closed container to ignite, and the reaction generates carbon dioxide, water vapor and an unknown substance x. Measure the mass of the substance before and after the reaction, anhydrous ethanol is 4.6g and 0g, oxygen is 8g and 0g, carbon dioxide is 0g and 4.4g, water is 0g and 5.4g, substance x is 0g and mg, the value of m is ______, and the molecular formula of substance x is ______.”

(Note, in order to facilitate future teaching, Li Zexuan unified the common units at the front of the four textbooks, but this is only a written unification, and the actual unification will depend on the joint efforts of teachers and students of Yanhuang Academy in the future.)

Although he had already prepared for the difficulty of the test, the first question was such a practical application plus calculation question, which still surprised Wang Ji. Shouldn't he test the basic concepts first?

But this question is mainly about the law of conservation of mass in the process of chemical reaction. After a little calculation, he got the correct answer.

At this time, he couldn't help but feel fortunate in his heart. Fortunately, he has also studied new arithmetic, otherwise how could he calculate so fast?

"The second question, put two glass cups a and b on the two plates of the balance. The glass cups contain dilute sulfuric acid of different masses but both contain 9.8g of sulfuric acid. It is known that the a glass cup is heavier than the b glass cup. Now After the two glass cups a and b are respectively put into the same mass of iron and zinc, and the balance is kept in balance, the maximum mass difference between the glass a and b before the reaction is ___ or _______.”

(Note, this kind of balance has existed in ancient times, and it was produced earlier. By the late Spring and Autumn Period, the manufacturing technology of balances and weights has been quite sophisticated. Bamboo pieces are used as beams, silk threads are used as knobs, and the ends are suspended A copper plate. Later, because the balance was troublesome to weigh heavy objects, it was changed to "quan", and the balance was only used when weighing small objects)

Although Wang Ji had never seen things like sulfuric acid and zinc, he still knew their chemical reactions by heart, but why did this question seem more perverted than the previous one? You must have used the knowledge of equations in the new arithmetic, right?

Wang Ji's heart immediately began to gallop, and it was thanks to him that he had some research on new arithmetic. Otherwise, no matter how familiar he was and how thoroughly he understood the "Chemistry" textbook, he would have to kneel when he encountered this test paper!

However, although Wang Ji had some research on new arithmetic, he was far from proficient. After solving a problem, he was already sweating profusely, as if he had run ten miles.

After finishing the second question, Wang Ji couldn't help raising his head. With his somewhat resentful eyes, he glanced at Li Zexuan and thought, "Does this old man have any grudge against you?" It's just a question, is it necessary to be so difficult?

This is not because he is hypocritical, but in a strict sense, Li Zexuan's question is somewhat "out of line". Moreover, all the test questions are biased towards practical application. It is basically difficult to get good grades by reading books alone!

"Hey, no matter how difficult it is, you have to fight! You can't lose this gamble!"

Although he only stayed in Yanhuang Academy for more than a month, Wang Ji felt that he had completely fallen in love with it, not only the environment, facilities and delicious food, but also the atmosphere of Yanhuang Academy. An atmosphere of unity and progress!

He doesn't want to leave!

The desire for survival is another kind of desire for survival!

The strong desire to survive made Wang Ji's mind clearer than ever, and his thinking became more active. Although most of the questions on the test papers were of the type he had never seen before, he could always find a way to solve them. After breaking through all the way, with half an hour before the end of the exam, Wang Ji finally came to the last question.

This is a question and answer question, "The mixture composed of sodium carbonate, sodium bicarbonate, calcium oxide and sodium hydroxide 37.2g, dissolved in a sufficient amount of water and fully reacted, all calcium ions, carbonate ions, and bicarbonate ions in the solution were Converted to precipitation, evaporate the water in the reaction vessel to dryness, and finally obtain 39.0g of white solid, what is the mass of sodium carbonate in the original mixture?"

The sequelae of breaking through all the way and performing exceptionally well is a pain in the brain. After seeing this last big question at this moment, Wang Ji felt that his head was about to explode! Because many substances in this question can interact with each other.

In fact, for Li Zexuan, who has received a modern higher education, this question is not difficult at all, because it is nothing more than involving multi-step reactions and multi-substance cross-reactions (calcium oxide reacts with water to form calcium hydroxide, calcium hydroxide It can react with sodium carbonate and sodium bicarbonate only), as long as you combine multiple chemical reactions into one and balance them to get a general chemical reaction, the whole problem will be solved without any difficulty. .

But for Wang Ji, a beginner in Chemistry, he obviously doesn't know how to do this, so what should I do? He must take this question!

After thinking about it for a long time, Wang Ji couldn't come up with a very clever and simple method. He gritted his teeth, and decided to use the most stupid method to solve this problem, which is to use the method of equations.

"Isn't it because there are more unknowns? It doesn't matter, solve it! The old man doesn't believe it, and I can't solve it today~!"

Wang Ji secretly ruthlessly said in his heart.

At the same time, he couldn't help but sigh, is this the "Chemistry" exam or the "Arithmetic" exam? For the calculation, he used three pieces of scratch paper!

Fortunately, he used the pencil given by Li Zexuan. If he used a brush, Wang Ji felt that he didn't need to take the exam, and he would be exhausted just to polish the ink~!

"Clang clang ~!"

"Okay, the time is up, Mr. Wang, please

Stop writing~! "

At four o'clock in the application time, the gongs and drums of the academy sounded, and Li Zexuan immediately got up and said.

Wang Ji just finished writing the last word at this time, and he let out a big sigh. He thought that an hour and a half was more than enough time, but now he doesn't even have time to check, so he has to hand in the papers.

"Hehe~! Wang Wugong, how was the test?"

As soon as Wang Ji handed in the papers, Yan Siru immediately asked aloud.

I don't know if it was gloating or worrying in that tone.

"No way, no way! I'll talk about other things later, this old man has a headache right now, he has to go back and rest for a while~!

Wang Ji frowned, cocked his head, stood up and said with a painful expression, this exam, he used his brain a little too much.

"Mr. Wang is not feeling well? Would you like the boy to call a doctor for you?"

Li Zexuan asked worriedly, he didn't want to ruin the "genius" Wang Ji because of an exam.

"No need, the old man just feels a little tired, after a sleep it should be fine~!"

Wang Ji waved his hand.

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